It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that a man came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah! My mother has passed away, and she had a month's worth of fasts due upon her. Can I make them up on her behalf? The Prophet (peace and blessings be upon him) said: "Tell me, if your mother had a debt, would you pay it off or not?" He said: Of course. The Prophet said: "Then Allah's debt is more deserving of being paid."