Allah's statement,

﴿وَإِذَا تُلِيَتْ عَلَيْهِمْ ءَايَـتُهُ زَادَتْهُمْ إِيمَـناً﴾

(And when His Ayat are recited unto them, they increase their faith;) is similar to His statement,

﴿وَإِذَا مَآ أُنزِلَتْ سُورَةٌ فَمِنْهُمْ مَّن يَقُولُ أَيُّكُمْ زَادَتْهُ هَـذِهِ إِيمَـناً فَأَمَّا الَّذِينَ ءامَنُواْ فَزَادَتْهُمْ إِيمَـناً وَهُمْ يَسْتَبْشِرُونَ ﴾

(And whenever there comes down a Surah, some of them (hypocrites) say: "Which of you has had his faith increased by it'' As for those who believe, it has increased their faith, and they rejoice) ﴿9:124﴾.

Al-Bukhari and other scholars relied on this Ayah (8:2) and those similar, as evidence that faith increases and varies in strength from heart to heart. This is also the view of the majority of the scholars of Islam, prompting some scholars, such as Ash-Shafi`i, Ahmad bin Hanbal and Abu `Ubayd to declare that this is the consensus of the Ummah, as we mentioned in the beginning of the explanation of Sahih Al-Bukhari. All the thanks and praises are due to Allah.