It wasnarrated from Abu Hurairah that the Messenger of Allah (ﷺ)said:
"When anyone of you yawns, let him put his hand over his mouthandnot make a sound, because Satan laughs at him." (PT)
English reference (PT): Vol. 1, Book 5, Hadith 968 (PT)
Arabic reference (PT): Book 5, Hadith 1021 (PT)