Tazkiyah — Allah ﷻ swears eleven oaths, then delivers a single verdict: the one who purifies the soul has succeeded. Everything else is secondary.
At the opening of Surah Ash-Shams, Allah ﷻ swears by the sun, the moon, the day, the night, the sky, the earth, and the soul itself — eleven oaths in succession, the longest string of oaths in the Quran — and then delivers a single statement they all build toward: “He has succeeded who purifies it, and he has failed who corrupts it.” (Quran 91:9–10). The “it” is the nafs, the self. Purifying it is success; corrupting it is failure. The weight of eleven oaths falls on that one sentence, and everything else in a human life is secondary to it. Tazkiyah al-nafs — the purification of the soul — is the deliberate, sustained work this verse calls for: removing what corrupts the inner self and cultivating what purifies it.
What Tazkiyah Means
Tazkiyah — تَزْكِيَة — comes from the root zakaa, which carries two meanings at once: to purify and to grow. The very same root gives us zakat, the obligatory charity that purifies wealth through giving and causes it to grow in blessing. Applied to the soul, tazkiyah is both a cleansing and a cultivation — the removal of what is corrupt and the growth of what is wholesome, together. It is not a single event: not a one-off retreat, not a moment of conversion, not a single act of repentance after which the work is done. It is an ongoing process, requiring the same consistency and daily care as the maintenance of physical health. You do not exercise once and call yourself fit for life; nor is the soul purified once and left.
This work was, in fact, the very mission for which the Prophet ﷺ was sent. Allah ﷻ says: “It is He who sent among the unlettered a Messenger from themselves, reciting to them His verses and purifying them (yuzakkihim) and teaching them the Book and wisdom.” (Quran 62:2). Notice that purification is named as a distinct task alongside the teaching of scripture — the Prophet ﷺ did not only convey information; he purified souls. Tazkiyah is therefore not an optional extra for the spiritually ambitious. It is the heart of the prophetic mission itself.
What Corrupts the Nafs
The scholars of the heart — al-Ghazali ؒ in the Ihya’, Ibn al-Qayyim ؒ, and others — mapped the primary diseases that corrupt the nafs, treating them not as mere moral failings to be condemned but as conditions of the heart to be diagnosed and cured. The chief among them are kibr (pride), hasad (envy), riya’ (showing off), hubb al-dunya (love of the world over the Hereafter), ghadab (uncontrolled anger), and bukhl (miserliness). Each is addressed repeatedly in the Quran and Sunnah, and for each the tradition offers a specific treatment rather than mere condemnation.
Pride is treated by remembering one’s origin and one’s end, and by the regular muhasaba (self-accounting) that punctures self-importance. Envy is treated by making du‘a for the very person one envies and by contentment with Allah’s ﷻ distribution. Showing off is treated by hiding good deeds and purifying the intention. Love of the world is treated by remembering death and loosening attachment. This is the essential insight of tazkiyah: the diseases of the heart are treatable, and the treatment is known. The work is not to feel ashamed of having these diseases — everyone does — but to apply the cures.
What Purifies the Nafs
The Quran and Sunnah identify clear channels through which the soul is purified. The Quran names, in the verse of the prophetic mission, three: the recitation of Allah’s ﷻ verses with reflection, the teaching of the Book, and the teaching of wisdom (62:2) — that is, Quran taken in with a reflective heart, and knowledge that is learned and then acted upon. To these the Sunnah adds a set of concrete daily practices, each targeting the diseases directly.
Muhasaba — self-accounting. The regular, honest examination of one’s own conduct and motives, taking oneself to account before being taken to account. ‘Umar ؓ counselled: “Call yourselves to account before you are called to account.” This is the diagnostic tool of tazkiyah — you cannot treat a disease of the heart you have not noticed.
Dhikr — remembrance. Consistent remembrance keeps the heart polished and present. “Truly it is in the remembrance of Allah ﷻ that hearts find rest” (13:28). Dhikr is to the heart what water is to a thirsty plant.
Voluntary fasting. Fasting beyond the obligatory trains the nafs in restraint, weakening its grip on appetite and desire — a direct exercise against the commanding self.
Sadaqah from what is beloved. Giving in charity, especially from what one loves, is the direct treatment for miserliness and love of the world. “You will never attain righteousness until you spend from that which you love” (Quran 3:92).
The company of the righteous. The Prophet ﷺ likened a good companion to a seller of musk, from whom one catches a good scent (Bukhari 2101). Keeping the company of those whose hearts are oriented to Allah ﷻ transfers something of their state; the environment shapes the soul.
None of these are advanced practices reserved for an elite. They are the ordinary tools of the ordinary Muslim who wants to do the one work the Quran says determines success. Every believer has access to muhasaba, dhikr, a voluntary fast, a charitable gift, and better company. The barrier is never access; it is only the decision to begin.
One further point protects the whole project from despair. Tazkiyah is a work of striving, not of achieving perfection — and Allah ﷻ, who commanded it, knows the human being He commanded. The Prophet ﷺ said: “All the children of Adam are sinners, and the best of the sinners are those who repent.” (al-Tirmidhi 2499, and reported as hasan). The purified soul is not the sinless soul; it is the soul that keeps returning, keeps polishing, keeps applying the cures even after it falls. The scholars caution against two opposite errors: the arrogance of thinking one has arrived, and the despair of thinking the diseases are incurable. The middle path is steady, patient work — treating each fault as it appears, returning after each slip, and trusting that the One who made the purification a duty also made it possible. Progress, not perfection, is the measure.
“He has succeeded who purifies it.” Eleven oaths building to that single verdict. The Quran has already settled the question of whether tazkiyah matters; it named it the very definition of success and the mission of the Prophet ﷺ himself. The only question left is a personal one: what are you doing about the state of your soul today?
Frequently Asked Questions
What is tazkiyah in Islam?
Tazkiyah al-nafs is the purification of the soul — the ongoing process of removing what corrupts the inner self (pride, envy, showing off, love of the world, anger, miserliness) and cultivating what purifies it. From the root zakaa (to purify and to grow), it was the very mission of the Prophet ﷺ (Quran 62:2) and the Quran names it the defining condition of human success (Quran 91:9–10).
How do you purify your soul in Islam?
Through the prophetic practices, each targeting a disease of the heart: sincere tawbah for each sin, regular muhasaba (self-accounting) to notice what the nafs pulls toward, consistent dhikr to keep the heart polished, voluntary fasting to train restraint, sadaqah from what you love to treat miserliness, Quran with reflection, and the company of the righteous. All are available to every Muslim without prerequisite.
What are the diseases of the heart in Islam?
The scholars of the heart — al-Ghazali ؒ, Ibn al-Qayyim ؒ — identified the chief ones as kibr (pride), hasad (envy), riya’ (showing off), hubb al-dunya (love of the world over the Hereafter), ghadab (uncontrolled anger), and bukhl (miserliness). Each is treated as a curable condition with a specific remedy, not merely a moral failing to be condemned.
Is tazkiyah only for advanced or scholarly Muslims?
No. Tazkiyah was the mission of the Prophet ﷺ for the whole community (Quran 62:2), and its tools — muhasaba, dhikr, voluntary fasting, sadaqah, reflective Quran, and good company — are the ordinary practices of the ordinary Muslim. None require special conditions or prerequisites. The barrier is never access; it is only the decision to begin the work the Quran calls the definition of success.
What does the Quran say about purifying the soul?
In Surah Ash-Shams, after eleven oaths, Allah ﷻ declares: “He has succeeded who purifies it, and he has failed who corrupts it” (91:9–10) — making the purification of the nafs the very measure of success and failure. And Quran 62:2 names purification (yuzakkihim) as a core task of the Prophet’s ﷺ mission, alongside reciting the verses and teaching the Book and wisdom.