Sayyiduna Samurah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said one day: "Is anyone from Banu al-Najjar here?" He (peace and blessings be upon him) called out three times, but no one answered. Then a man answered him (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Did you hear my call?" He said: "Yes." He (peace and blessings be upon him) said: "So-and-so among you who has passed away has been held back from Paradise because of the debt he owes. If you wish, ransom him, and if you wish, hand him over to the punishment of Allah."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6722