Jami` at-Tirmidhi, Book 43, Hadith 2970 (In-Book) ⓘ

Narrated Abu Hurairah: that the Messenger of Allah said: "The sneeze is from Allah and the yawn is from Ash-Shaitan. So when one of you yawns let him cover his mouth with his hand. For when he says 'Ah, Ah' Ash-Shaitan laughs from inside his opening." [And indeed Allah loves the sneeze and He dislikes the Yawn, so when a man says Ah, Ah when yawning, indeed Ash-Shaitan laughs from inside his opening."]

حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنِ ابْنِ عَجْلاَنَ، عَنِ الْمَقْبُرِيِّ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ الْعُطَاسُ مِنَ اللَّهِ وَالتَّثَاؤُبُ مِنَ الشَّيْطَانِ فَإِذَا تَثَاءَبَ أَحَدُكُمْ فَلْيَضَعْ يَدَهُ عَلَى فِيهِ وَإِذَا قَالَ آهْ آهْ فَإِنَّ الشَّيْطَانَ يَضْحَكُ مِنْ جَوْفِهِ وَإِنَّ اللَّهَ يُحِبُّ الْعُطَاسَ وَيَكْرَهُ التَّثَاؤُبَ فَإِذَا قَالَ الرَّجُلُ آهْ آهْ إِذَا تَثَاءَبَ فَإِنَّ الشَّيْطَانَ يَضْحَكُ فِي جَوْفِهِ ‏" ‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ ‏.‏