Qur'an 9:124

And whenever a surah is revealed there are some of them who say: Which one of you hath thus increased in faith? As for those who believe, it hath increased them in faith and they rejoice (therefor).

And whenever a chapter is revealed, there are some of them who say: Which of you has it strengthened in faith? Then as for those who believe, it strengthens them in faith and they rejoice.

Kuma idan aka saukar(2) da wata sũra, to, daga gare su akwai waɗanda suke cħwa: "Wãne ne a cikinku wannan sũra ta ƙãra masa ĩmãni?" To amma waɗanda suka yi ĩmãni, to, ta ƙara musu imani, kuma sũ, sunã yin bushãra (da ita).

Faith of the Believers increases, while Hypocrites increase in Doubts and Suspicion Allah said, وَإِذَا مَا أُنزِلَتْ سُورَةٌ ... And whenever there comes down a Surah, then among the hypocrites are, ... فَمِنْهُم مَّن يَقُولُ أَيُّكُمْ زَادَتْهُ هَـذِهِ إِيمَانًا ... some of them say: "Which of you has had his faith increased by it!'' They say to each other, who among you had his faith increased by this Surah (from the Qur'an). Allah the Exalted said, ... فَأَمَّا الَّذِينَ آمَنُواْ فَزَادَتْهُمْ إِيمَانًا وَهُمْ يَسْتَبْشِرُونَ ﴿١٢٤﴾ As for those who believe, it has increased their faith, and they rejoice. This Ayah is one of the mightiest evidences that faith increases and decreases, as is the belief of most of the Salaf and later generations of scholars and Imams. Many scholars said that there is a consensus on this ruling. We explained this subject in detail in the beginning of the explanation of Sahih Al-Bukhari, may Allah grant him His mercy. Allah said next,