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." (RU)
English reference (RU): Vol. 1, Book 5, Hadith 968 (RU)
Arabic reference (RU): Book 5, Hadith 1021 (RU)