8:2The believers are those whose hearts tremble when God is mentioned, and when His revelations are recited to them, they strengthen them in faith, and upon their Lord they rely.

8:11He made drowsiness overcome you, as a security from Him. And He sent down upon you water from the sky, to cleanse you with it, and to rid you of Satan’s pollution, and to fortify your hearts, and to strengthen your foothold.