Hadith 846

Al-Bara' bin 'Azib (May Allah be pleased with them) reported: The Messenger of Allah (PBUH) commanded us to do seven things: to visit the sick, to follow the funeral (of a dead believer), to invoke the Mercy of Allah upon one who sneezes (i.e., by saying to him: Yarhamuk- Allah), to support the weak, to help the oppressed, to promote the greeting of 'As-Salamu 'Alaikum', and to help those who swear to do something to keep their oaths.

[Al-Bukhari and Muslim].