Sahih Bukhari | Volume 1 | Hadith Number 793

Narrated by '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).