Narrated Abu Huraira: I heard Allah's Apostle saying, "The rights of a Muslim on the Muslims are to follow the funeral processions, to accept invitation and to reply the sneezer. (see Hadith No 331)
Hadith ReferenceSahih Bukhari / The Book of Al-Janaiz (Funerals) / Hadith: 1240
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة