The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 983
'A'isha reported: Never did I, see the Apostle of Allah (may peace be upon him) 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.