Musannaf Ibn Abi Shayba 33:690

Abu Mu'awiyah narrated to us, from al-A'mash, from Ibrahim, from Alqamah, who said: Blood of Mu'addid got onto his garment. He said: So he washed it, but its trace did not go away. He said: And he used to pray in it, and he would say: "It only increases my love for it, that it is the blood of Mu'addid."