The Prophet (peace and blessings be upon him) said:
"Indeed, your brother is held back (from entering Paradise) because of his debt, so pay it off on his behalf."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 1550
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[حم هـ هق] عن سعد بن الأطول. أحكام الجنائز ١٥.