The Prophet (ﷺ) said: A man's prayer does not avail him unless he keeps his back steady when bowing and prostrating.
Sunan Abi Dawud Book 2, Hadith 465
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I witnessed Muhammed(ﷺ) –Abu Kamil’s version has the wording: The Messenger of Allah(ﷺ)-during his prayer. I found his standing like his bowing and prostration and his moderation in bowing was like that of his prostration, and his sitting between the two prostration and his prostration(and his sitting between the salutation) and going away( after finishing the prayer) were nearly equal to one another.
Abu Dawud said: Musaddad said: His bowing and his moderation in bowing and prostration, and his prostration and his sitting between the two prostrations, and his prostration and sitting between the salutation and going away (after finishing the prayer) were nearly equal.
Sunan Abi Dawud Book 2, Hadith 464 Next Hadith → When the Messenger of Allah(ﷺ) entered the mosque, a man also entered it and prayed. He then came and saluted the Messenger of Allah(ﷺ). The Messenger of Allah(ﷺ) returned the salutation and said to him: Go back and pray, for you have not prayed. The man returned and prayed as he prayed before. He then came to prophet(ﷺ) and saluted him. The Messenger of Allah(ﷺ) said to him: “ And upon you be peace. “ Go back and pray, for you have not prayed. He did so three times. Then the man said: By Him who has sent you(as a Prophet) with truth; I cannot do better than this; so teach me. He said: When you get up to pray, utter the takbir(Allah is most great); then recite a convenient portion of the Qur’an; then bow and remain quietly in that position; then sit and remain quietly in that position; then raise yourself and stand erect: then prostrate yourself and remain quietly in that position; then sit and remain quietly in that position; then do that throughout all your prayer.
Abu Dawud said: Al-Qa’nabi reported this tradition from Sa’id b. Abi Sa’Id on the authority of Abu Hurairah. This version has the wording in the last: When you do this, then your prayer is completed. If you omit anything form this, you omit that much from your prayer. This version also has the wording: when you get up for praying, perform the abulation perfectly.
Sunan Abi Dawud Book 2, Hadith 466
Abu Dawud said: Musaddad said: His bowing and his moderation in bowing and prostration, and his prostration and his sitting between the two prostrations, and his prostration and sitting between the salutation and going away (after finishing the prayer) were nearly equal.
Sunan Abi Dawud Book 2, Hadith 464 Next Hadith → When the Messenger of Allah(ﷺ) entered the mosque, a man also entered it and prayed. He then came and saluted the Messenger of Allah(ﷺ). The Messenger of Allah(ﷺ) returned the salutation and said to him: Go back and pray, for you have not prayed. The man returned and prayed as he prayed before. He then came to prophet(ﷺ) and saluted him. The Messenger of Allah(ﷺ) said to him: “ And upon you be peace. “ Go back and pray, for you have not prayed. He did so three times. Then the man said: By Him who has sent you(as a Prophet) with truth; I cannot do better than this; so teach me. He said: When you get up to pray, utter the takbir(Allah is most great); then recite a convenient portion of the Qur’an; then bow and remain quietly in that position; then sit and remain quietly in that position; then raise yourself and stand erect: then prostrate yourself and remain quietly in that position; then sit and remain quietly in that position; then do that throughout all your prayer.
Abu Dawud said: Al-Qa’nabi reported this tradition from Sa’id b. Abi Sa’Id on the authority of Abu Hurairah. This version has the wording in the last: When you do this, then your prayer is completed. If you omit anything form this, you omit that much from your prayer. This version also has the wording: when you get up for praying, perform the abulation perfectly.
Sunan Abi Dawud Book 2, Hadith 466