Musannaf Ibn Abi Shayba 1:2023

Zajir ibn al-Salt narrated to us, from al-Harith ibn Malik, who said: I went to the house of al-Hasan. Then a man came and asked him, saying: "O Abu Sa'id, a man spends the night in a garment, and he wakes up and there is a large amount of flea blood on it. Should he wash it, or sprinkle it with water, or pray in it?" He said: "He should not sprinkle it with water, nor should he wash it; he should pray in it."