Musnad Abu Ya'la al-Mawsili 134:10

Wasil ibn Abd al-A’la narrated to us, Ibn Fudayl narrated to us, from al-A’mash, from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) would be invited to barley bread and rancid fat, and he would accept. And he had a coat of mail held as a pledge with a Jew; he did not find what would redeem it until he died.