Supressing yawning in prayer

 345. Abu Sa´id Al-Khudri narrated that the Messenger of Allah sallahu alayhi wa sallam said: ´´When one of you yawns in Salat, let him supress as much as he can. Verily, the devil enters inside.´´ In another narration: ´´one should keep his hand on the mouth, because the devil enters inside.´´