Narrated Aisha:
"When the "Surat-An-Nasr", 'When comes the Help of Allah and the conquest,' had been revealed to the Prophet (ﷺ) he did not offer any prayer except that he said therein, "Subhanka Rabbana wa bihamdika; Allahumma ighfirli (I testify the Uniqueness of our Lord, and all the praises are for Him: O Allah, forgive me!") (DE)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 491 (DE)
Arabic reference (DE): Book 65, Hadith 4967 (DE)