Allah’s Messenger (S.A.W) said:

“ALLAH dislikes Yawning”

So next time……if any of you feels the urge to yawn, let him resist it as much as he can, for if any of you says ‘Ha’ (makes a noise), the Shaytan laughs.”

– Saheeh al-Bukharee (no. 3289)

“… and if any of you yawns,

let him place his Hand over his mouth.”

Al-Tirmidhi (2746)