Narrated from Abu Hurayrah that the Messenger of Allah (ﷺ) said:

“The rights of one Muslim over another are six.” It was said: What are they, O Messenger of Allaah? He said:

1. If you meet him, greet him with salaam;
2. if he invites you, accept the invitation;
3. if he asks for advice, give him sincere advice;
4. if he sneezes and praises Allah, say Yarhamuk Allah (may Allah have mercy on you);
5. if he falls sick, visit him; and
6. if he dies, attend his funeral.

Sahih Muslim 2162