Volume 1, Book 12, Number 793:
Narrated ‘Abdullah bin Malik bin Buhaina:
Once Allah’s Apostle led us in the Zuhr prayer and got up (after the prostrations of the second
Rak’a) although he should have sat (for the Tashah-hud). So at the end of the prayer, he prostrated
twice while sitting (prostrations of Sahu).
Volume 1, Book 12, Number 771:
Narrated ‘Abdullah bin Malik bin Buhaina:
Whenever the Prophet used to offer prayer he used to keep arms away (from the body) so that the
whiteness of his armpits was visible.