Musnad Abi Ya'la 1580 — he came with a group of the people

It is narrated from Abu Talhah al-Khawlani (may Allah have mercy on him) that he came with a group of the people of Palestine to Sayyiduna Umayr bin Sa'd (may Allah be pleased with him), who because of his perfect excellence was called "Nasij Wahdihi" (one without equal). We sat on a large platform in his house, and he said to his servant: "O boy! Water the horses." The narrator said: There was a stone trough in the house. The servant said: "Such-and-such a mare has scabies and blood (or perhaps he said: water) is dripping from her." He commanded again: "Water them." At this one of those present said: "Then all the horses will get scabies." Sayyiduna Umayr (may Allah be pleased with him) said: "Water them, for I heard the Messenger of Allah (peace and blessings be upon him) saying: 'There is no reality to disease spreading by itself, to taking evil omens, or to the ill omen of the owl (and such superstitions). Have you not seen the camels in the desert, how a mark of scabies suddenly appears on the chest or the soft part of the belly of one of them that was not there before? Then who infected the first one?'"