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)

[Machine] The Prophet ﷺ used to say often: "Subhanaka Allahumma wa bihamdika Allahumma, ighfirli" which means "Glory be to You, O Allah, and praise be to You, O Allah, forgive me." When the verse was revealed: "When the victory of Allah and the conquest comes" (Quran 110:1), he said: "Subhanak Allahumma wa bihamdika Allahumma, ighfirli innaka anta at-tawwab" which means "Glory be to You, O Allah, and praise be to You, O Allah, forgive me, indeed You are the Acceptor of repentance."

كَانَ النَّبِيُّ ﷺ يُكْثِرُ أَنْ يَقُولَ سُبْحَانَكَ اللهُمَّ وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي فَلَمَّا نَزَلَتْ إِذَا جَاءَ نَصْرُ اللهِوَالْفَتْحُ قَالَ سُبْحَانَكَ اللهُمَّ وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ

[Machine] "When the victory of Allah and the conquest came to the Messenger of Allah ﷺ, he used to increase in reciting and performing rak'ahs (units of prayer) and say, 'Glory be to You, O Allah, our Lord, and praise be to You. O Allah, forgive me, for You are the Forgiver, the Merciful,' three times."

لَمَّا أُنْزِلَ عَلَى رَسُولِ اللهِ ﷺ إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ كَانَ يُكْثِرُ إِذَا قَرَأَهَا وَرَكَعَ أَنْ يَقُولَ سُبْحَانَكَ اللهُمَّ رَبَّنَا وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ ثَلَاثًا

[Machine] Indeed, the Prophet ﷺ used to frequently say, "Subhanaka Rabbana wa bihamdika Allahumma ighfirli," which means "Glory be to You, our Lord, and praise be to You, O Allah. O Allah, forgive me." He said this when the following verse was revealed: "When comes the help of Allah, and victory, and you see mankind entering the religion of Allah in troops. Celebrate the praises of your Lord, and pray for His forgiveness: for He is Oft-Returning (in forgiveness) and Most Merciful." (Quran 110: 1-3)

أَنَّ النَّبِيَّ ﷺ كَانَ مِمَّا يُكْثِرُ أَنْ يَقُولَ سُبْحَانَكَ رَبَّنَا وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي قَالَ فَلَمَّا نَزَلَتْ إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ قَالَ سُبْحَانَكَ رَبَّنَا وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ

[Machine] Since it was revealed to the Messenger of Allah ﷺ that when the victory of Allah and the conquest comes, he used to say it frequently after reciting it and then he bowed down with it, saying: "Glorified are You, our Lord, and praise be to You. O Allah, forgive me, for You are the Accepter of repentance, the Merciful" three times.

مُنْذُ أُنْزِلَ عَلَى رَسُولِ اللهِ ﷺ إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ كَانَ يُكْثِرُ أَنْ يَقُولَ إِذَا قَرَأَهَا ثُمَّ رَكَعَ بِهَا أَنْ يَقُولَ سُبْحَانَكَ رَبَّنَا وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ ثَلَاثًا

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. (Using translation from Muslim 484c)

مَا رَأَيْتُ النَّبِيَّ ﷺ مُنْذُ نَزَلَ عَلَيْهِ إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ يُصَلِّي صَلَاةً إِلَّا دَعَا وَقَالَ سُبْحَانَكَ رَبِّي وَبِحَمْدِكَ اللهُمَّ 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 help of Allah and the victory comes [in Surah An-Nasr], the messenger of Allahﷺ used to say a lot: 'Glory be to You, O Allah, and with Your praise, O Allah, forgive me. You are the Acceptor of repentance, O Allah, forgive me. Glory be to You, O Allah, and with Your praise, O Allah, forgive me. Glory be to You, O Allah, and with Your praise, O Allah, forgive me.'"

لَمَّا نَزَلَتْ {إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ} [النصر 1] كَانَ رَسُولُ اللهِ ﷺ يُكْثِرُ أَنْ يَقُولَ سُبْحَانَكَ اللهُمَّ وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ اللهُمَّ اغْفِرْ لِي سُبْحَانَكَ اللهُمَّ وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي سُبْحَانَكَ اللهُمَّ وَبِحَمْدِكَ

[Machine] "When the verse (So exalt the name of your Lord, the Most Great) [Qur'an 56:74] was revealed, Abdul Razzaq said: When the victory of Allah and the conquest comes, the Prophet ﷺ would often say: 'Glory be to You, O Allah, and all praise is due to You. O Allah, forgive me, for You are the accepter of repentance.'"

لَمَّا نَزَلَتْ {فَسَبِّحْ بِحَمْدِ رَبِّكَ وَاسْتَغْفِرْهُ إِنَّهُ كَانَ تَوَّابًا} [النصر 3] قَالَ عَبْدُ الرَّزَّاقِ لَمَّا نَزَلَتْ إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ كَانَ النَّبِيُّ ﷺ يُكْثِرُ أَنْ يَقُولَ سُبْحَانَكَ اللهُمَّ وَبِحَمْدِكَ اللهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ

[Machine] The translation is as follows: The Messenger of Allah ﷺ used to frequently say, "Subhanak Allahumma wa bihamdik" (Glory be to You, our Lord, and praise be to You). But when the victory from Allah (God) and the conquest came, he said, "Subhanak Allahumma wa bihamdik Allahumma, forgive me. Indeed, You are the Oft-Forgiving, Most Merciful."

كَانَ رَسُولُ اللَّهِ ﷺ يُكْثِرُ أَنْ يَقُولَ «سُبْحَانَكَ رَبَّنَا وَبِحَمْدِكَ» فَلَمَّا نَزَلَتْ إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ قَالَ «سُبْحَانَكَ رَبَّنَا وَبِحَمْدِكَ اللَّهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ»

[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 رَسُولُ اللهِ ﷺ يُكْثِرُ أَنْ يَقُولَ فِي ركُوعِهِ وَسُجُودِهِ: سُبْحَانَكَ اللَّهُمَّ رَبَّنَا وَبِحَمْدِكَ، اللَّهُمَّ اغْفِر لِي - يَتَأَوَّلُ القُرْآنَ- يَعْنِي {إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ} ".