Sahih al-Bukhari 4967
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · Chapter 1
Narrated Aisha:
حَدَّثَنَا الْحَسَنُ بْنُ الرَّبِيعِ ، حَدَّثَنَا أَبُو الأَحْوَصِ ، عَنِ الأَعْمَشِ ، عَنْ أَبِي الضُّحَى ، عَنْ مَسْرُوقٍ ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ مَا صَلَّى النَّبِيُّ صلى الله عليه وسلم صَلاَةً بَعْدَ أَنْ نَزَلَتْ عَلَيْهِ {إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ} إِلاَّ يَقُولُ فِيهَا " سُبْحَانَكَ رَبَّنَا وَبِحَمْدِكَ، اللَّهُمَّ اغْفِرْ لِي " .
"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!")