Dua in Rukoo

اَللَّهُمَّ لَكَ رَكَعْتُ، وَبِكَ آمَنْتُ، وَلَكَ أَسْلَمْتُ، أَنْتَ رَبِّي، خَشَعَ لَكَ سَمْعِي وَبَصَرِي وَمُخِّي وَعَظْمِي وَعَصَبِي وَمَا اِسْتَقَلَّتْ بِهِ قَدَمِي لِلَّهِ رَبِّ الْعَالَمِينَ

Transliteration

Allahumma laka raka’tu wa bika amantu wa laka aslamtu, anta rabbi khasha’a laka sam’i wa basari wa mukh-khi wa ‘azmi wa ‘asabi wa ma istaqallat bihi qadami lillahi rabbil ‘alamin

Meaning

O Allah, I have bowed down to You, I have believed, I have surrendered. You are my Rabb, my ear-eye, my brain, my bones, my spine and my legs, all that you are carrying (i.e. my existence) have been humbled before Allah Almighty.

Source: Sahih (Al-Aini). Nukhbul Afkaar 4/247