Silsilah as-Sahihah 2626 — General greeting of Salam

It is narrated from Sayyiduna Hudhayfah bin Yaman (may Allah be pleased with him) that the Noble Prophet (peace and blessings of Allah be upon him) said: "When a believer meets another believer, greets him with salam, and shakes hands with him, their sins fall away like the leaves of a tree."