1. When one meets his Muslim brother, he should greet him with salaam.
عن علي رضي الله عنه قال قال رسول الله صلى الله عليه وسلم : للمسلم على المسلم ست بالمعروف يسلم عليه إذا لقيه ويجيبه إذا دعاه ويشمته إذا عطس ويعوده إذا مرض ويتبع جنازته إذا مات ويحب له ما يحب لنفسه. )الترمذي رقم 2736)
Hadhrat Ali (Radhiallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “A Muslim has six rights over his Muslim brother. When he meets him he should greet him (with salaam); if he invites him he should accept his invitation; when he sneezes (and says Alhamdulillah) he should reply to his sneeze by saying ‘Yarhamukallah’; when he falls ill he should visit him; when he passes away he should attend his Janaazah; and he should love for him what he loves for himself.