198. Dua For Ruku (Allahumma Laka Rakatu Wa Bika Amantu)
اَللَّهُمَّ لَكَ رَكَعْتُ وَبِكَ آمَنْتُ وَلَكَ أَسْلَمْتُ خَشَعَ لَكَ سَمْعِيْ وَبَصَرِيْ وَمُخِّيْ وَعِظَامِيْ وَعَصَبِيْ
اَللّٰهُمَّ لَكَ رَكَعْتُ وَبِكَ اٰمَنْتُ وَلَكَ اَسْلَمْتُ خَشَعَ لَكَ سَمْعِىْ وَبَصَرِىْ وَمُخِّىْ وَعِظَامِىْ وَعَصَبِىْ
Allaahumma laka raka'tu, wa bika 'aamantu, wa laka 'aslamtu khasha'a laka sam'ee, wa basaree, wa mukhkhee, wa 'idhaamee, wa 'asabee
Translation
O Allah, to You I bow (in prayer) and in You I believe and to You I have submitted. Before You my hearing is humbled, as is my sight, my mind, my bones, my nerves.
Ali (RA) said, Rasulullah (ﷺ) used to say these words in rukoo.