مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3722
Musnad of Abdullah bin Mas'ood
It was narrated that 'Abdullah (رضي الله عنه) said: After the verse "When there comes the Help of Allah (to you, O Muhammad (ﷺ) against your enemies) and the Conquest (of Makkah)" (an-Nasr 110:1) was revealed to the Messenger of Allah (ﷺ), if he recited it and bowed, he would often say: "Glory and praise be to You, O Allah our Lord. O Allah, forgive me, for You are the Acceptor of repentance, the Most Merciful,” three times.
Musnad Ahmad 3745Hasan because of corro-borating evidence, this is a da'eef i