The Messenger of Allah ﷺ said, "When one of you sneezes, let him say, 'Praise be to Allah.' Those around him should respond, 'May Allah have mercy on you,' and he should reply to them, 'May Allah guide you and set your affairs right.'"
حدثنا أبو بكر بن أبي شيبة حدثنا علي بن مسهر عن ابن أبي ليلى عن عيسى بن عبد الرحمن عن عبد الرحمن بن أبي ليلى
قال رسول الله ﷺ إذا عطس أحدكم فليقل الحمد لله وليرد عليه من حوله يرحمك الله وليرد عليهم يهديكم الله ويصلح بالكم
[Its chain is daif] Tirmidhi recorded it in the Book of Manners, in the chapter on how one responds to a person who sneezes, hadith 2741, from the hadith of Ibn Abu Layla with this wording, and Busiri graded it daif because of Ibn Abu Layla, hadith 854. Ibn Abu Layla was inconsistent in his narration, in addition to being weak, and the hadith in Bukhari (6224) is sufficient in its place.