Silsilah as-Sahihah 2812 — Repeating Three Times for Emphasis

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that when the Noble Prophet (peace and blessings be upon him) would say something, he would repeat it three times until it was well understood, and when he would come to a people and greet them with salam, he would say salam three times as well.