The Messenger of Allah ﷺ said: The nearest a servant comes to his Lord is when he is prostrating himself, so make supplication (in this state).  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ أَقْرَبُ مَا يَكُونُ الْعَبْدُ مِنْ رَبِّهِ وَهُوَ سَاجِدٌ فَأَكْثِرُوا الدُّعَاءَ  

The Messenger of Allah ﷺ used to say while prostrating himself: O Lord, forgive me all my sins, small and great, first and last, open and secret.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَقُولُ فِي سُجُودِهِ اللَّهُمَّ اغْفِرْ لِي ذَنْبِي كُلَّهُ دِقَّهُ وَجِلَّهُ وَأَوَّلَهُ وَآخِرَهُ وَعَلاَنِيَتَهُ وَسِرَّهُ  

The Messenger of Allah (may peace be upon him') often said while bowing and prostrating himself:" Glory be to Thee, O Allah, our Lord, and praise be to Thee, O Allah, forgive me," thus complying with the (command in) the Qur'an.  

كَانَ رَسُولُ اللَّهِ ﷺ يُكْثِرُ أَنْ يَقُولَ فِي رُكُوعِهِ وَسُجُودِهِ سُبْحَانَكَ اللَّهُمَّ رَبَّنَا وَبِحَمْدِكَ اللَّهُمَّ اغْفِرْ لِي يَتَأَوَّلُ الْقُرْآنَ  

Hallowed be Thou, and with Thy praise, I seek forgiveness from Thee and return to Thee. She reported: I said: Messenger of Allah, what are these words that I find you reciting? He said: There has been made a sign for me in my Ummah; when I saw that, I uttered them (these words of glorification for Allah), and the sign is:" When Allah's help and victory..... to the end of the surah.  

كَانَ رَسُولُ اللَّهِ ﷺ يُكْثِرُ أَنْ يَقُولَ قَبْلَ أَنْ يَمُوتَ سُبْحَانَكَ وَبِحَمْدِكَ أَسْتَغْفِرُكَ وَأَتُوبُ إِلَيْكَ قَالَتْ قُلْتُ يَا رَسُولَ اللَّهِ مَا هَذِهِ الْكَلِمَاتُ الَّتِي أَرَاكَ أَحْدَثْتَهَا تَقُولُهَا قَالَ جُعِلَتْ لِي عَلاَمَةٌ فِي أُمَّتِي إِذَا رَأَيْتُهَا قُلْتُهَا { إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ} إِلَى آخِرِ السُّورَةِ  

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  

The Messenger of Allah ﷺ often would say, "subḥāna Allāhi wa-bi-ḥamdihī, astaghfiru Allāh wa-atūbu ilayhi (Glory be to Allah and with His praise, I seek the forgiveness of Allah and I repent to Him.)"

She said: I asked: Messenger of Allah, I see that you often repeat the saying subḥāna Allāhi wa-bi-ḥamdihī astaghfiru Allāh wa-atūbu ilayhi. He said, "My Lord informed me that I would soon see a sign in my Ummah. So when I see it I often say: subḥāna Allāhi wa-bi-ḥamdihī, astaghfiru Allāh wa-atūbu ilayhi. Indeed I saw it ˹when this āyah˺ was revealed: 'When the Help of Allah and the victory came,' i.e. Conquest of Makkah, 'And you see the people entering into the religion of Allah in multitudes, Then exalt ˹Him˺ with praise of your Lord and ask forgiveness of Him. Indeed, He is ever Accepting of repentance.' (Naṣr 110:1-3"  

كَانَ رَسُولُ اللَّهِ ﷺ يُكْثِرُ مِنْ قَوْلِ: «(سُبْحَانَ اللَّهِ وَبِحَمْدِهِ، أَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ۔)»

قَالَتْ فَقُلْتُ: يَا رَسُولَ اللَّهِ أَرَاكَ تُكْثِرُ مِنْ قَوْلِ سُبْحَانَ اللَّهِ وَبِحَمْدِهِ أَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ۔ فَقَالَ: «خَبَّرَنِي رَبِّي أَنِّي سَأَرَى عَلاَمَةً فِي أُمَّتِي، فَإِذَا رَأَيْتُهَا أَكْثَرْتُ مِنْ قَوْلِ سُبْحَانَ اللَّهِ وَبِحَمْدِهِ أَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ، فَقَدْ رَأَيْتُهَا: {إِذَا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ} فَتْحُ مَكَّةَ {وَرَأَيْتَ النَّاسَ يَدْخُلُونَ فِي دِينِ اللَّهِ أَفْوَاجًا * فَسَبِّحْ بِحَمْدِ رَبِّكَ وَاسْتَغْفِرْهُ إِنَّهُ كَانَ تَوَّابًا}۔»  

I asked 'Ata': What do you recite when you are in a state of bowing (in prayer)? He said:" Hallowed be Thou, and with Thy praise, there is no god but Thou." Son of Abd Mulaika narrated to me on the anthority of 'A'isha (who reported): I missed one night the Messenger of Allah ﷺ (from his bed). I thought that he might have gone to one of his other wives. I searched for him and then came back and (found him) in a state of bowing, or prostration, saying: Hallowed be Thou and with Thy praise; there is no god but Thou. I said: With my father mayest thou be ransomed and with my mother. I was thinking of (another) affair, whereas you are (occupied) in another one.  

قُلْتُ لِعَطَاءٍ كَيْفَ تَقُولُ أَنْتَ فِي الرُّكُوعِ قَالَ أَمَّا سُبْحَانَكَ وَبِحَمْدِكَ لاَ إِلَهَ إِلاَّ أَنْتَ فَأَخْبَرَنِي ابْنُ أَبِي مُلَيْكَةَ عَنْ عَائِشَةَ قَالَتِ افْتَقَدْتُ النَّبِيَّ ﷺ ذَاتَ لَيْلَةٍ فَظَنَنْتُ أَنَّهُ ذَهَبَ إِلَى بَعْضِ نِسَائِهِ فَتَحَسَّسْتُ ثُمَّ رَجَعْتُ فَإِذَا هُوَ رَاكِعٌ أَوْ سَاجِدٌ يَقُولُ سُبْحَانَكَ وَبِحَمْدِكَ لاَ إِلَهَ إِلاَّ أَنْتَ فَقُلْتُ بِأَبِي أَنْتَ وَأُمِّي إِنِّي لَفِي شَأْنٍ وَإِنَّكَ لَفِي آخَرَ  

One night I missed Messenger of Allah ﷺ from the bed, and when I sought him my hand touched the soles of his feet while he was in the state of prostration; they (feet) were raised and he was saying:" O Allah, I seek refuge in Thy pleasure from Thy anger, and in Thy forgiveness from Thy punishment, and I seek refuge in Thee from Thee (Thy anger). I cannot reckon Thy praise. Thou art as Thou hast lauded Thyself."  

فَقَدْتُ رَسُولَ اللَّهِ ﷺ لَيْلَةً مِنَ الْفِرَاشِ فَالْتَمَسْتُهُ فَوَقَعَتْ يَدِي عَلَى بَطْنِ قَدَمَيْهِ وَهُوَ فِي الْمَسْجِدِ وَهُمَا مَنْصُوبَتَانِ وَهُوَ يَقُولُ اللَّهُمَّ أَعُوذُ بِرِضَاكَ مِنْ سَخَطِكَ وَبِمُعَافَاتِكَ مِنْ عُقُوبَتِكَ وَأَعُوذُ بِكَ مِنْكَ لاَ أُحْصِي ثَنَاءً عَلَيْكَ أَنْتَ كَمَا أَثْنَيْتَ عَلَى نَفْسِكَ  

All Glorious, All Holy, Lord of the Angels and the Spirit.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَقُولُ فِي رُكُوعِهِ وَسُجُودِهِ سُبُّوحٌ قُدُّوسٌ رَبُّ الْمَلاَئِكَةِ وَالرُّوحِ  

This hadith has been narrated on the authority of 'A'isha by another chain of transmitters.  

عَنِ النَّبِيِّ ﷺ بِهَذَا الْحَدِيثِ