˹Remember (before the battle of Badr)˺ when He caused drowsiness to overcome you, giving you serenity. And He sent down rain from the sky to purify you, free you from Satan’s whispers, strengthen your hearts, and make ˹your˺ steps firm.
Meaning:-
serenity: the quality of being peaceful and calm:
whisper: communicate in, When you speak very quietly, so that hardly anyone can hear.