Mishkatul Masabih — Hadith #39677

He said, Rasulullah (Sallallahu Alaihi Wasallam) said: A Muslim has six rights over a Muslim. He was asked, O Messenger of God! What are these rights? In reply he said, (1) If he meets a Muslim, he will give salam, (2) to you If someone calls you, you will accept it, (3) If someone asks you for good, you will advise him to do good, (4) If you sneeze, he will say Yarhamukall-ha, (5) If someone is sick, you will visit him, (6) If someone dies, you will participate in his funeral. [1]