It was narrated from Jabir bin 'Abdullah that:
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 'a…
It was narrated from Muhammad bin Maslamah that:
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,…