Zaid b. Aslam said that ‘Umar b. al-Khattab drank some milk which pleased him and asked the man who gave him the drink where that milk had come from. He informed him that he had gone down to a watering-place which he named and found there some camels which had been given as sadaqa being watered. Saying that the people had drawn off some of their milk, he added,“I put it in this milk-skin of mine, and this is it.”‘Umar thereupon put his hand in his mouth and made himself vomit. Malik and Baihaqi, in Shu’ab al-iman, transmitted it.