Abu Musa reported the Prophet as saying, “The greatest sin in God's sight, after the serious sins which God has prohibited, which a man can bring into His presence is that he should die in debt without leaving enough to discharge it.”
‘Amr b. ‘Auf al-Muzani reported the Prophet as saying, “Reconciliation is allowable between Muslims except such as makes unlawful something which is lawful, or makes lawful something which is unlawful ; and Muslims must keep to the conditions they have made, except for a condition which makes unlawful something which is lawful, or makes lawful something which is unlawful.”
Tirmidhi, Ibn Majah and Abu Dawud transmitted it, but Abu Dawud's transmission ended at “the conditions they have made.”
Abu Sa'id al-Khudrl said that a corpse was brought to the Prophet on a bier for him to pray over it and he asked the people whether their friend owed anything. On being told that he did, he asked whether he had left anything to discharge it, and when they replied that he had not, he told them to pray over him. But ‘Ali b. Abu Talib said, “I shall be responsible for his debt, Messenger of God,” so he went forward and prayed over him. A version has something to the same effect, adding that he said, “May God redeem your pledges from hell as you have redeemed the pledges of your brother Muslim! No Muslim will discharge his brother’s debt without God redeeming his pledges on the day of resurrection.”
