whenever a chapter is sent down to you some ask which of you has it increased in belief it will surely increase the belief of the believers and they are joyful.
وإذا ما أنزلت سورة فمنهم من يقول أيكم زادته هذه إيمانا فأما الذين آمنوا فزادتهم إيمانا وهم يستبشرون