This is part 6 of 6 of “Good Manners and Form (Al-Adab)”, book 78 of Sahih al-Bukhari — Hadith 6,224–6,226. The book is long enough that it is split across 6 pages so each one stays quick to load; the parts run in order and are linked at the foot of the page.
حَدَّثَنَا مَالِكُ بْنُ إِسْمَاعِيلَ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ أَبِي سَلَمَةَ، أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ دِينَارٍ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِذَا عَطَسَ أَحَدُكُمْ فَلْيَقُلِ الْحَمْدُ لِلَّهِ. وَلْيَقُلْ لَهُ أَخُوهُ أَوْ صَاحِبُهُ يَرْحَمُكَ اللَّهُ. فَإِذَا قَالَ لَهُ يَرْحَمُكَ اللَّهُ. فَلْيَقُلْ يَهْدِيكُمُ اللَّهُ وَيُصْلِحُ بَالَكُمْ ".
Narrated Abu Huraira:The Prophet (ﷺ) said, " If anyone of you sneezes, he should say 'Al-Hamduli l-lah' (Praise be to Allah), and his (Muslim) brother or companion should say to him, 'Yar-hamuka-l-lah' (May Allah bestow his Mercy on you). When the latter says 'Yar-hamuka-llah", the former should say, 'Yahdikumul-lah wa Yuslih balakum' (May Allah give you guidance and improve your condition)
حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا سُلَيْمَانُ التَّيْمِيُّ، قَالَ سَمِعْتُ أَنَسًا ـ رضى الله عنه ـ يَقُولُ عَطَسَ رَجُلاَنِ عِنْدَ النَّبِيِّ صلى الله عليه وسلم فَشَمَّتَ أَحَدَهُمَا وَلَمْ يُشَمِّتِ الآخَرَ. فَقَالَ الرَّجُلُ يَا رَسُولَ اللَّهِ شَمَّتَّ هَذَا وَلَمْ تُشَمِّتْنِي. قَالَ " إِنَّ هَذَا حَمِدَ اللَّهَ، وَلَمْ تَحْمَدِ اللَّهَ ".
Narrated Anas:Two men sneezed before the Prophet (ﷺ) and he said Tashmit to one of them, while he did not say Tashmit to the other. So that man said, "O Allah's Messenger (ﷺ)! You said Tashmit to that fellow but you did not say Tashmit to me. "The Prophet (ﷺ) said, "That man praised Allah, but you did not praise Allah
Narrated Abu Huraira:The Prophet (ﷺ) said, "Allah loves sneezing but dislikes yawning; so if anyone of you sneezes and then praises Allah, every Muslim who hears him (praising Allah) has to say Tashmit to him. But as regards yawning, it is from Satan, so if one of you yawns, he should try his best to stop it, for when anyone of you yawns, Satan laughs at him
Text from the open hadith-api dataset. Hadith numbering follows that edition and can differ slightly from a printed copy — check the Arabic against a trusted mushaf of hadith before relying on a reference.