Jami` at-Tirmidhi: Book 48, Hadith 54

Ali bin Abi Talib narrated that : when the Messenger of Allah would stand for the obligatory prayer, he would raise his hands to the level of his shoulder, and he would do this lā manjā minka wa lā malja’a illā ilaik, astaghfiruka wa atūbu ilaik).” Then he would recite, then when he would bow, his speech in his Ruku`, would be to say: “O Allah, to You have I bowed, and in You have I believed, and to You have I submitted (in Islam), and You are my Lord. My hearing, my sight, my brain and my bones are humbled to Allah, the Lord of the Worlds all that exists (Allāhumma laka raka`tu wa bika āmantu wa laka aslamtu wa anta rabb ī. Khasha`a sam`ī wa baṣarī wa mukhkhī wa `aẓmī lillāhi, rabbil-`ālamīn).” Then, when he raised his head from Ruku he would say: “Allah hears the one who praises him (Sami`a Allāhu liman ḥamidah).” Then he would follow it with: “O Allah, our Lord, to You is praise filling the heavens and the earth and filling whatever You wish of things afterward (Allāhumma rabbanā wa lakal-ḥamdu mil’as-samāwāti wal-arḍi, wa mil’a mā shi’ta min shay’in ba`d.).” Then, when prostrated he would say in his prostration: “O Allah, to You have I prostrated, and in You have I believed, and to You have I submitted (in Islam), and You are my Lord, my face has prostrated to the One that created it, and granted its hearing and sight, Blessed is Allah, the Best of Creators (Allāhumma laka sajadtu wa bika āmantu wa laka aslamtu wa anta rabbī, sajada wajhi lilladhī khalaqahū wa shaqqa sam`ahū wa baṣarahū, tabārak Allāhu ahsanul-khāliqīn).” When he was finished with his Salat, we would say: “O Allah, forgive me what I have done, before and after, and what I have hidden, and what I have done openly, and You are my Deity, there is none worthy of worship except You (Allāhummaghfirlī mā qaddamtu wa mā akhkhartu wa mā asrartu wa mā a`lantu, wa anta ilāhī lā ilāha illā ant).”