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).”
Jami` at-Tirmidhi Book 48, Hadith 54
"I was hiding beneath the covering of the Ka'bah, and three men came along - a man from the Quraish, and two of his brothers-in-law from Thaqif, or a man from Thaqif and two of his brothers-in-law from Quraish. Their bellies were fat, and they did not have much understanding. They said something that I could not understand, then one of them said: 'Do you think that Allah can hear what we are talking about?' Another said: 'If we raise our voices, He will hear it, but if we do not raise our voices, He will not hear it.' The other one said: 'If He can hear something from us, then He can hear all of it.'" 'Abdullah said: "I mentioned that to the Prophet (ﷺ), so Allah revealed: 'And you have not been hiding yourselves, lest your ears and your eyes and your skin should testify against you...' up to His saying: '...and you have become of those utterly lost! (42:22 & 23)"
Jami` at-Tirmidhi Book 47, Hadith 301