Musnad Abu Ya'la al-Mawsili 160:201

And with his chain of narration, he said: The Messenger of Allah (ﷺ) said: "Whoever has a debt upon him, let him pay it to him or seek to be absolved of it before he pays it on a day when there is neither gold nor silver." They said: "Then with what will he pay it, O Messenger of Allah?" He said: "It will be taken from his good deeds. If they are sufficient, [it will be paid]; otherwise, some of the bad deeds of the other [person] will be cast upon him."