question #1 Sahih Muslim 484c, Book 4, Hadith 249 : What supplication did the Prophet Muhammad (ﷺ) frequently make in his prayers after the revelation of certain verses?

Never did I, see the Messenger of Allah (ﷺ) after the revelation (of these verses):” When Allah’s help and victory came.” observin- his prayer without making (this supplication) or he said in it (supplication): Hallowed be Thee, my Lord, and with Thy praise, O Allah, forgive me.