A vow made on condition is one of the most common worries among believers. Someone says, « If I pass my exam, I will give charity, » and then wonders whether those words now bind them. The answer depends on what was actually said, whether the condition has occurred, and whether the person is able to keep the promise.
What makes a conditional vow a nadhr?
A nadhr is a commitment, made to Allah, to perform an act of worship that was not obligatory before. It can be unconditional, or tied to a condition: if a particular thing happens, I will do a particular act of worship. Passing an exam followed by giving charity has exactly this shape, so it is a conditional nadhr and not merely a hope or an intention.
It differs from a promise made to a person, and from an oath (yamin), which is sworn by Allah to do or to avoid something. A sincere wish, such as hoping to pass and planning to give charity regardless, creates no binding obligation. What makes it a nadhr is the explicit commitment of an act of worship to Allah.
Why Islam discourages vows, and what happens when the condition occurs
The Prophet ﷺ forbade vowing and explained his reason: « Indeed, it does not bring any good; rather it is only a means to extract something from the miser. » A vow does not change what Allah has decreed. Ibn Qudamah explains in al-Mughni that this prohibition makes vowing disliked rather than forbidden, which is why believers are encouraged to ask Allah directly and to give charity freely instead of tying it to a result.
As long as the condition has not occurred, nothing is due. Once it occurs, the vow becomes binding. A companion who had vowed a night of i’tikaf before embracing Islam received this answer from the Prophet ﷺ: « Then fulfill your vow. » And when he was asked about a vow that a deceased mother had left unfulfilled, he said: « Fulfill it on her behalf, » which shows that a valid vow does not lapse on its own.
How to fulfil a conditional vow of charity
When the stated condition occurs, the person carries out the act of worship they vowed: in the example, the exam is passed, so the charity is given. If the vow named a particular sum or kind of charity, that is what is owed. Hanbali scholars, cited by IslamQA, also allow the vowed act to be done before the condition occurs, just as the expiation for an oath may be offered before the oath is broken.
The Qur’an describes the people of righteousness: « They perform (their) vows, and they fear a Day whose evil flies far and wide. » Keeping a vow is therefore an act of faith that is rewarded, not only a legal step. Ordinary effort or inconvenience does not cancel it: a vow is an extra commitment, and some effort in keeping it is expected.
If you cannot fulfil the vow: what expiation applies?
For a vow like this one, made in return for a hoped-for outcome, a person who is able must fulfil it: the expiation is not an alternative to choose instead. The question only arises when the person truly cannot carry it out. The Prophet ﷺ said: « The expiation for a vow is the same as the expiation for an oath. » The Qur’an describes that expiation in Al-Ma’idah 89: « for expiation, feed ten indigent persons, on a scale of the average for the food of your families; or clothe them; or give a slave his freedom. If that is beyond your means, fast for three days. »
Scholars differ on the scope of this hadith. The Hanbali school applies it to anyone who becomes truly unable to fulfil a vow: Ibn Qudamah states in al-Mughni that such a person must offer the expiation for breaking an oath, and IslamQA follows this view. Many Shafi’i scholars apply it mainly to a vow made in anger or to pressure oneself; for a vow of gratitude like this one, the charity then remains owed until the person is able to give it.
In practice, the first step is the same in every view: give what you vowed as soon as the condition occurs. If you truly cannot, the Hanbali view means feeding or clothing ten people in need, or fasting three days if that is beyond your means, while under the Shafi’i view the vowed charity waits until you can give it. You can check what the expiation for an oath involves to see the options laid out clearly, and read what to do when you cannot fulfil a vow for related cases. IslamQA sets out the conditions and the reward of fulfilling a vow of worship in the ruling on fulfilling a vow to perform an act of worship.
A conditional vow costs nothing until its condition occurs, then binds; the expiation is a remedy for real inability, not a way out of a promise one can keep.
Sources quoted
Every quotation was checked word for word against the Quran and hadith texts in our database.
- Surah Al-Ma’ida, verse 89
- Surah Al-Insan, verse 7
- Hadith narrated by al-Bukhari and Muslim — authentic
- Hadith narrated by al-Bukhari and Muslim — authentic
- Hadith narrated by Muslim — authentic
- Hadith narrated by al-Bukhari and Muslim — authentic
The Al Muslim Plus editorial team · tested on November 3, 2026