Sayyidah Khawlah (may Allah be pleased with her) said: The Messenger of Allah (peace and blessings be upon him) said: "Allah Almighty does not purify a nation in which the weak cannot take his right from the strong without hindrance." And he said: "Whoever parts from his debtor while he is pleased with him, the creatures of the earth and the fish of the seas supplicate for him; and whoever parts from his debtor while he is displeased with him, wrongdoing is recorded against him in every day, night, Friday and month."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21005