Mishkat al-Masabih 2956

Abu Umama told of hearing God's Messenger say, “A loan must be paid back, a minha* must be returned, a debt must be discharged, and one who stands surety is held responsible.” Tirmidhi and Abu Dawud transmitted it.*This may be a she camel lent for a time for milking, but it can be used of other things which are lent for some specific purpose.