Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Anas (may Allah be pleased with him), he says: The Messenger of Allah (peace and blessings of Allah be upon him) met Sayyiduna Abu Dharr (may Allah be pleased with him) and said: "O Abu Dharr! Shall I not inform you of two qualities, the performance of which is easy, but they will be heavier on the scale than all other good deeds?" He said: Yes, O Messenger of Allah! You (peace and blessings of Allah be upon him) said: "Adhere to good character and prolonged silence. By the One in Whose hand is my soul! The creation has not done any deed equal to (these two virtues)."