The Prophet (may Allah's peace and blessings be upon him) did not offer a prayer after the revelation of {When there comes Allah’s help and the conquest} [Surat an-Nasr: 1] except that he would say therein: "Subhānaka Rabbana wa bihamdik, Allāhumma ighfir li (Glory and praise be to You, our Lord. O Allah, forgive me)

Explanation

‘Ā’ishah, Mother of the Believers (may Allah be pleased with her), informs that upon the revelation of {When there comes Allah’s help and the conquest} to the Prophet (may Allah's peace and blessings be upon him), he complied with the command in the Qur’an and hastened to obey the command of Allah Almighty in His saying: {Then glorify the praise of your Lord, and ask His forgiveness}. Therefore, he used to frequently say in his Rukū‘ (bowing) and Sujūd (prostration) during the prayer, "Glory be to You," and may You be Exalted above any deficiency that does not befit You. "And praise, O Allah, our Lord," praise that is rightfully due to You for the perfection of Your essence, attributes, and actions. "O Allah, forgive me" and erase and overlook my sin.

Lessons

• It is recommended to say this supplication frequently in Rukū‘ and Sujūd.
• Seeking forgiveness at the end of one’s life serves as a reminder to conclude acts of worship—especially the prayer—with seeking forgiveness to make up for any shortcomings that might have occurred in them.
• The best thing to use in imploring Allah for accepting supplications is mentioning His praises, exalting Him, and declaring Him free from imperfections and flaws.
• The merit of seeking Allah's forgiveness and pursuing it in all conditions.
• The perfect servitude of the Prophet (may Allah's peace and blessings be upon him) and his compliance with the command of Allah.