Sahih al-Bukhari 1852

Musa ibn Ismail narrated to us; Abu Awana narrated to us, from Abu Bishr, from Said ibn Jubayr, from Ibn Abbas (may Allah be pleased with them both), that a woman from Juhayna came to the Prophet and said: My mother vowed to perform Hajj, but she died before doing so. Should I perform Hajj on her behalf? He said: Yes, perform Hajj on her behalf. He then asked: If your mother had owed a debt, would you have paid it? Pay the debt owed to Allah, for Allah is more deserving that His due be fulfilled.