Al-Nasaa’i (4605) narrated that Muhammad ibn Jahsh (may Allaah be pleased with him) said:
We were sitting with the Messenger of Allaah (peace and blessings of Allaah be upon him

) when he raised his head towards the sky, then he put his palm on his forehead and said: “Subhaan-Allaah! What a strict issue has been revealed to me!” We remained silent and were afraid. The following morning I asked him, “O Messenger of Allaah, what is this strict issue that has been revealed?” He said, “By the One in Whose hand is my soul, if a man were killed in battle for the sake of Allaah, then brought back to life, then killed and brought back to life again, then killed, and he owed a debt, he would not enter Paradise until his debt was paid off.” Classed as hasan by al-Albaani in Saheeh al-Nasaa’i, 4367.
The Prophet (peace and blessings of Allaah be upon him

) refrained from offering the funeral prayer for one who had died owing two dinars, until Abu Qataadah (may Allaah be pleased with him) promised to pay it off for him. When he saw him the following day and said, I have paid it off, the Prophet (peace and blessings of Allaah be upon him) said: “Now his skin has become cool for him.” Musnad Ahmad (3/629); classed as hasan by al-Nawawi in al-Khalaasah (2/931) and by Ibn Muflih in al-Adaab al-Shar’iyyah (1/104).