It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever holds his brother's honour or wealth taken by wrongdoing should return it to his brother before the Day of Resurrection comes, when no dirham or dinar will be accepted from him. If he has righteous deeds, they will be taken from him and given to the one he wronged; and if he has no righteous deeds, the (other's) sins will be taken and placed upon him."
Imam Bukhari (may Allah have mercy on him) narrated a similar report from Ibn Abi Dhi'b, and in it he mentioned these words: "He should settle it today, before (the time comes) when he will have no dirham or dinar."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6513