He reported God's Messenger as saying, “Delay in payment by a rich man is injustice, but when one of you is referred for payment to a wealthy* man he should accept the reference."
(Bukhari and Muslim.)
*Mali'. This word is used of a wealthy man, and also of one who cannot be called wealthy but who is careful to pay his debts.
Abu Huraira told that a man demanded payment of a debt from God's Messenger in a most uncivil manner and his companions were vexed, but he said, “Leave him alone, for one who has a right is entitled to speak, and buy him a camel and give it to him." When they told him that all they could find was one of a more excellent age than the man was entitled to, he said, “Buy it and give him it, for the best person among you is he who discharges his debt in the best manner."
Ka'b b. Malik said that in the time of God’s Messenger he made demand in the mosque for payment of a debt due to him from Ibn Abu Hadrad and their voices rose till God’s Messenger, who was in his house, heard them. He went out to them and removing the curtain of his chamber called to Ka'b b. Malik addressing him by name. He replied, “At your service, Messenger of God", whereupon he made a gesture with his hand indicating that he should remit half the debt due to him, and when Ka'b expressed his willingness he told the other to get up and discharge his debt.
God’s Messenger borrowed a young camel, and when the camels of the sadaqa came to him he ordered me to pay the man his young camel. When I told him that I could find only an excellent camel in its seventh year he said, “Give it to him, for the best person is he who discharges his debt in the best manner."
