Supplications during ruku
اَللّٰهُمَّ لَكَ رَكَعْتُ، وَبِكَ اٰمَنْتُ، وَلَكَ أَسْلَمْتُ خَشَعَ لَكَ سَمْعِيْ، وَبَصَرِيْ وَمُخِّيْ، وَعَظْمِيْ، وَعَصَبِيْ، وَمَا اسْتَقَلَّتْ بِهٖ قَدَمِيْ لِلہِ رَبِّ الْعَالَمِیْنَ
O Allah, unto You I have bowed (in prayer) and in You I have believed and to You I have submitted. Before You my hearing is humbled, as is my sight, my mind, my bones, my tendons and what my feet carry.
References
[Musnad Ahmad - 1/119]
