The Prophet ﷺ did not perform any prayer after the revelation of “When Allah’s help comes and the victory” except that he would say in it:

subḥānak allāhumma wa-bi-ḥamdika, allāhumma ighfirlī

“Glory be to You, our Lord, and praise be to You. O Allah, forgive me.”

مَا صَلَّى النَّبِيُّ ﷺ صَلاَةً بَعْدَ أَنْ نَزَلَتْ عَلَيْهِ { إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ } إِلاَّ يَقُولُ فِيهَا:

(سُبْحَانَكَ رَبَّنَا وَبِحَمْدِكَ اللَّهُمَّ اغْفِرْ لِي)

Never did I, see the Messenger of Allah ﷺ 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.

مَا رَأَيْتُ النَّبِيَّ ﷺ مُنْذُ نَزَلَ عَلَيْهِ { إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ} يُصَلِّي صَلاَةً إِلاَّ دَعَا أَوْ قَالَ فِيهَا سُبْحَانَكَ رَبِّي وَبِحَمْدِكَ اللَّهُمَّ اغْفِرْ لِي

[Machine] "When the victory of Allah and the conquest came, I never saw the Messenger of Allah ﷺ praying any prayer except that he would say: 'Subhanak Allahumma wa bihamdika, Allahumma ighfirli.'"

لَمَّا أُنْزِلَتْ إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ إِلَى آخِرِهَا مَا رَأَيْتُ رَسُولَ اللهِ ﷺ صَلَّى صَلَاةً إِلَّا قَالَ سُبْحَانَكَ رَبَّنَا وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي

[Machine] When the victory of Allah and the conquest come (i.e., when the help of Allah and the conquest of Makkah occurred), the Prophet ﷺ used to frequently say: "Subhanaka Allahumma wa bihamdika Allahumma, ighfir li innaka antat-Tawwab (Glory be to You, O Allah, and all praise is due to You, O Allah, forgive me for You are the Most Forgiving.)"

لَمَّا نَزَلَتْ إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ كَانَ النَّبِيُّ ﷺ يُكْثِرُ أَنْ يَقُولَ سُبْحَانَكَ اللهُمَّ وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ

[Machine] "When the verse 'When the victory of Allah has come and the conquest' until the end of it was revealed, I did not see the Messenger of Allah ﷺ perform any prayer without saying, 'Subhanaka Allahumma wa bihamdika Allahumma ighfirli' meaning 'Glory be to You, O Allah, and all praise is due to You, O Allah, forgive me.'"

لَمَّا نَزَلَتْ {إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ} إِلَى آخِرِهَا مَا رَأَيْتُ رَسُولَ اللَّهِ ﷺ صَلَّى صَلَاةً إِلَّا قَالَ «سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ اللَّهُمَّ اغْفِرْ لِي»

"كَانَ النَّبِىُّ ﷺ يُكْثِرُ حينَ نَزَلَتْ: {إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ} أَنْ يَقُولَ: "سُبْحَانَكَ اللَّهُمَّ وَبحَمْدِكَ، اللَّهُمَّ اغْفِرْ لِى أَنْتَ التَّوَّابُ".