Malik related to me from Yahya ibn Said that Abud-Darda wrote to Salman al-Farsi, "Come immediately to the holy land." Salman wrote back to him, "Land does not make anyone holy. Mans deeds make him holy. I have heard that you were put up as a doctor to treat and cure people. If you are innocent, then may you have delight! If you are a quack, then beware lest you kill a man and enter the Fire!" When Abud-Darda judged between two men, and they turned from him to go, he would look at them and say, "Come back to me, and tell me your story again. A quack! By Allah!"