(97) باب مَا جَاءَ فِي التَّثَاؤُبِ
Abu Sa'id al-Khudri reported the Messenger of Allah (May peace be upon him) as saying:
When one of you yawns, he should hold his hand over his mouth, for the devil enters. (FR)
Reference (FR): Sunan Abi Dawud 5026 (FR)
In-book reference (FR): Book 43, Hadith 254 (FR)
English translation (FR): Book 42, Hadith 5008 (FR)