When the Messenger of Allah ﷺ bowed, he said: "Allahumma laka rakʿatu was laka aslamtu wa bika amantu, khashaʿa laka samʿi wa basri wa ʿizami wa mukhi wa ʿasabi (O Allah, to You I have bowed and to You I have submitted and in You I have believed. My hearing, sight, bones, brain and sinews are humbled before You)."  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا رَكَعَ قَالَ اللَّهُمَّ لَكَ رَكَعْتُ وَلَكَ أَسْلَمْتُ وَبِكَ آمَنْتُ خَشَعَ لَكَ سَمْعِي وَبَصَرِي وَعِظَامِي وَمُخِّي وَعَصَبِي  

When the Prophet ﷺ bowed, he said: "Allahumma laka rak'atu wa bika amantu wa laka aslamtu wa alayka tawwakaltu, anta Rabbi, khasha'a sam'i wa basri wa dammi wa lahmi wa 'azmi wa 'asabi Lillahi Rabbil-'Alamin ( O Allah, to You I have bowed, in You I believe, to You I have submitted and in You I put my trust. You are my Lord. My hearing, my sight, my blood, my flesh, my bones and sinews are humbled before Allah, the Lord of the Worlds.)"  

عَنِ النَّبِيِّ ﷺ كَانَ إِذَا رَكَعَ قَالَ اللَّهُمَّ لَكَ رَكَعْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ وَعَلَيْكَ تَوَكَّلْتُ أَنْتَ رَبِّي خَشَعَ سَمْعِي وَبَصَرِي وَدَمِي وَلَحْمِي وَعَظْمِي وَعَصَبِي لِلَّهِ رَبِّ الْعَالَمِينَ  

When the Messenger of Allah ﷺ stood to offer a voluntary prayer, he would say when he bowed: "Allahumma laka rak'atu wa bika amantu wa laka aslamtu wa alayka tawwakaltu, anta Rabbi, khasha'a sam'i wa basri wa lahmi wa dammi wa mukhi wa 'asabi Lillahi Rabbil-'Alamin ( O Allah, to You I have bowed, in You I believe, to You I have submitted and in You I put my trust. You are my Lord. My hearing, my sight, my flesh, my blood, my brain and my sinews are humbled before Allah, the Lord of the Worlds)."  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا قَامَ يُصَلِّي تَطَوُّعًا يَقُولُ إِذَا رَكَعَ اللَّهُمَّ لَكَ رَكَعْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ وَعَلَيْكَ تَوَكَّلْتُ أَنْتَ رَبِّي خَشَعَ سَمْعِي وَبَصَرِي وَلَحْمِي وَدَمِي وَمُخِّي وَعَصَبِي لِلَّهِ رَبِّ الْعَالَمِينَ  

ʿO Allah, to You I have bowed, in You I have believed and to You I have submitted. You are my Lord. My hearing my sight, my brain, my bones and my sinews submit to You. Whatever my feet carry is for Allah, the Lord of the Worlds.” (Using translation from Aḥmad 960)  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا رَكَعَ قَالَ «اللَّهُمَّ لَكَ رَكَعْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ أَنْتَ رَبِّي خَشَعَ سَمْعِي وَبَصَرِي وَمُخِّي وَعَظْمِي وَعَصَبِي وَمَا اسْتَقَلَّتْ بِهِ قَدَمِي لِلَّهِ رَبِّ الْعَالَمِينَ»  

[Machine] When the Messenger of Allah ﷺ would perform the rukoo' (bowing position), he would say, "O Allah, for you I have bowed and in You I believe, and to You I have submitted. My hearing, sight, mind, bones, and nerves all humble themselves for You." And when he would raise his head from the rukoo', he would say, "Allah hears the one who praises Him, our Lord, and to You belongs all praise, filling the heavens and the earth and all that is between them, and filling whatever You will after that."  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا رَكَعَ قَالَ «اللَّهُمَّ لَكَ رَكَعْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ خَشَعَ لَكَ سَمْعِي وَبَصَرِي وَمُخِّي وَعِظَامِي وَعَصَبِي » وَإِذَا رَفَعَ رَأْسَهُ قَالَ «سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ رَبَّنَا وَلَكَ الْحَمْدُ مِلْءَ السَّمَاوَاتِ وَالْأَرْضِ وَمِلْءَ مَا بَيْنَهُمَا وَمِلْءَ مَا شِئْتَ مِنْ شَيْءٍ بَعْدُ»  

When the Messenger of Allah ﷺ bowed, he said: "Allahumma laka rakʿatu was laka aslamtu wa bika amantu, khashaʿa laka samʿi wa basri wa ʿizami wa mukhi wa ʿasabi (O Allah, to You I have bowed and to You I have submitted and in You I have believed. My hearing, sight, bones, brain and sinews are humbled before You)." (Using translation from Nasāʾī 1050)  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا رَكَعَ قَالَ «اللهُمَّ لَكَ رَكَعْتُ وَلَكَ أَسْلَمْتُ وَبِكَ آمَنْتُ خَشَعَ لَكَ سَمْعِي وَبَصَرِي وَعِظَامِي وَمُخِّي وَعَصَبِي»  

When the Prophet ﷺ bowed, he said: "Allahumma laka rak'atu wa bika amantu wa laka aslamtu wa alayka tawwakaltu, anta Rabbi, khasha'a sam'i wa basri wa dammi wa lahmi wa 'azmi wa 'asabi Lillahi Rabbil-'Alamin ( O Allah, to You I have bowed, in You I believe, to You I have submitted and in You I put my trust. You are my Lord. My hearing, my sight, my blood, my flesh, my bones and sinews are humbled before Allah, the Lord of the Worlds.)" (Using translation from Nasāʾī 1051)  

عَنِ النَّبِيِّ ﷺ بِنَحْوٍ أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا رَكَعَ قَالَ «اللهُمَّ لَكَ رَكَعْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ وَعَلَيْكَ تَوَكَّلْتُ أَنْتَ رَبِّي خَشَعَ سَمْعِي وَبَصَرِي وَدَمِي وَلَحْمِي وَعَظْمِي وَعَصَبِي لِلَّهِ رَبِّ الْعَالَمِينَ»  

When the Messenger of Allah ﷺ stood to offer a voluntary prayer, he would say when he bowed: "Allahumma laka rak'atu wa bika amantu wa laka aslamtu wa alayka tawwakaltu, anta Rabbi, khasha'a sam'i wa basri wa lahmi wa dammi wa mukhi wa 'asabi Lillahi Rabbil-'Alamin ( O Allah, to You I have bowed, in You I believe, to You I have submitted and in You I put my trust. You are my Lord. My hearing, my sight, my flesh, my blood, my brain and my sinews are humbled before Allah, the Lord of the Worlds)." (Using translation from Nasāʾī 1052)  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا قَامَ يُصَلِّي تَطَوُّعًا يَقُولُ إِذَا رَكَعَ «اللهُمَّ لَكَ رَكَعْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ وَعَلَيْكَ تَوَكَّلْتُ أَنْتَ رَبِّي خَشَعَ جَمِيعُ سَمْعِي وَبَصَرِي وَلَحْمِي وَدَمِي وَمُخِّي وَعَصَبِي لِلَّهِ رَبِّ الْعَالَمِينَ»  

ʿO Allah, to You I have bowed, in You I have believed and to You I have submitted. You are my Lord. My hearing my sight, my brain, my bones and my sinews submit to You. Whatever my feet carry is for Allah, the Lord of the Worlds.” (Using translation from Aḥmad 960)   

أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا ابْتَدَأَ الصَّلَاةَ الْمَكْتُوبَةَ فَذَكَرَ الْحَدِيثَ وَفِيهِ قَالَ وَكَانَ إِذَا رَكَعَ قَالَ اللهُمَّ لَكَ رَكَعْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ أَنْتَ رَبِّي خَشَعَ لَكَ سَمْعِي وَبَصَرِي وَمُخِّي وَعَظْمِي وَمَا اسْتَقَلَّتْ بِهِ قَدَمِي لِلَّهِ رَبِّ الْعَالَمِينَ  

"اللَّهُمَّ لَكَ رَكَعتُ وَبِكَ آمَنْتُ، وَلَكَ أسْلَمْتُ، خَشَعَ لَكَ سَمعْي وَبَصَرِى، وَمُخِّي، وَعَظْمِى، وَعَصَبِى، وَشَعْرِى، وَبَشَرِى، وَمَا اسْتَقَلَّتْ بِه قَدَمِى".