Rights of a Muslim over his brother
[Sahih Muslim : Book 26, Number 5378]
Abu Huraira (Radi Allah Anhu) reported Allah's Messenger (sal-allahu- alleihi-wasallam ) as saying: Five are the rights of a Muslim over his brother:
1. Responding to salutation,
2. Saying Yarhamuk Allah when anybody sneezes and says AlHamdulillah,
3. Accept offer greetings from him,
4. Visiting the sick,
5. Following the bier."