General Behavior (Kitab Al-Adab)
43/100. Chapter:
How many times should one say "May Allah have mercy on you" to one who sneezes?
Sunan Abi Dawud
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنِ ابْنِ عَجْلاَنَ، قَالَ حَدَّثَنِي سَعِيدُ بْنُ أَبِي سَعِيدٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ شَمِّتْ أَخَاكَ ثَلاَثًا فَمَا زَادَ فَهُوَ زُكَامٌ .
Narrated AbuHurayrah: Respond three times to your brother when he sneezes, and if he sneezes more often, he has a cold in his head.
Reference : Sunan Abi Dawud 5034In-book reference : Book 43, Hadith 262English translation : Book 42, Hadith 5016