«إذا تثاءب أحدكم فليرده ما استطاع فإن أحدكم إذا قال: ها ضحك منه الشيطان»
The Prophet (peace and blessings be upon him) said:
"When one of you yawns, let him hold it back as much as he can, for when one of you says 'Ha' (making a sound while yawning), Satan laughs at him."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 425