´It was narrated that 'Ali bin Abu Talib said:` "I was sitting with the Prophet, and 'Ammar bin Yasir asked permission to enter. The Prophet said: 'Let him in, welcome to the good and the purified.'"
Hadith ReferenceSunan Ibn Majah / Chapter: The virtues of the Companions of the Messenger of Allah (saws) / Hadith: 146