Al-Lu'lu Wal-Marjan 1397 — The Book of As-Salâm (Greetings)

Abu Hurairah Narrated from:

I heard Allâh's Messenger صلى الله عليه وسلم saying, "The rights of a Muslim on a Muslim are five: (1) To return the greetings, (2) to visit the sick, (3) to follow the funeral processions (4) to accept invitation and (5) to reply the sneezer [saying, Yarhamu-ka-Allah (may Allâh be merciful to you), provided the sneezer says, Al-hamdu-lillah (all the praises are for Allâh)]. ( Sahîh Al-Bukhârî, Hadîth No. 332, Vol. 2 )