Sunan Ibn Majah Book 16, Hadith 6
“Do not forfeit items held in pledge.”
“A mount may be ridden when it is pawned, and its milk may be drunk when it is pawned, but the one who rides it or milks it must pay for its upkeep.' ”
(Allah (SWT) says:) “I am the opponent of three on the Day of Resurrection, and if I am someone's opponent I will defeat him: A man who makes promises in My Name, then proves treacherous; a man who sells a free man and consumes his price; and a man who hires a worker, makes use to him, then does not give him his wages.”