وَإِذَا تُلِيَتْ عَلَيْهِمْ آيَاتُهُ زَادَتْهُمْ إِيمَانًا
When His verses are recited to them, they increase them in faith. (Qur'an 8:2)
Hearing revelation can add understanding, renew remembrance, deepen reverence, and strengthen resolve to obey. Qur'an 9:124 likewise speaks of faith increasing with revealed material.
Some theologians relate this to new particular assents or to the effects and fruits of an established commitment; others see a strengthening of certainty itself. The issue is the intended sense of “faith,” not merely the merit of recitation.