Sayyiduna Abu al-Yasar (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) said: "Whoever would like to be shielded from the heat of Hell, let him give respite to a debtor or let go of a debt for one in hardship."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16424