It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him), he said: I came to the service of the Prophet (peace and blessings of Allah be upon him) when he had finished the prayer. Thus, I was the first person to greet in the manner of Islam. The Prophet (peace and blessings of Allah be upon him) said: "And upon you be peace and the mercy of Allah. Which tribe are you from?" I said: From the tribe of Ghifar.