Narrated Al-Bara' bin 'Azib (Radi-Allahu 'anhu):
(and he was not a liar) We used to pray behind the Prophet (Sallallahu 'Alaihi Wa Sallam) and when he said, "Sami' a-l-lahu Liman hamida", none of us would bend his back (to go for prostration) till the Prophet (Sallallahu 'Alaihi Wa Sallam) had placed his, forehead on the ground.
Bukhari Vol. 1 : No. 775
Narrated Malik bin Huwairith Al-Laithi (Radi-Allahu 'anhu):
I saw the Prophet (Sallallahu 'Alaihi Wa Sallam) praying and in the odd Rakat, he used to sit for a moment before getting up.
Bukhari Vol. 1 : No. 786
Narrated 'Abdullah bin 'Abdullah (Radi-Allahu 'anhu):
I saw 'Abdullah bin 'Umar crossing his legs while sitting in the prayer and I, a mere youngster in those days, did the same. Ibn 'Umar forbade me to do so, and said, "The proper way is to keep the right foot propped up and bend the left in the prayer." I said questioningly, "But you are doing so (crossing the legs)." He said, "My feet cannot bear my weight."
Bukhari Vol. 1 : No. 790