Sa'id bin Jubayr سعيد بن جبير الأسدي · The Book on Fasting

"A woman came to the Prophet and said: 'My sister died while she had two consecutive months of fasting due.' So he said: 'Do you not see that if there was a debt due from your sister then you would have to pay it?' She said: 'Yes.' He said: 'Then the right of Allah is more appropriate.'"

the Messenger of Allah said: "There are no days in which righteous deeds are more beloved to Allah than those ten days." They said: "O Messenger of Allah! Not even Jihad in Allah Cause?" The Messenger of Allah said: "Not even Jihad in Allah's Cause, unless a man were to out with his self and his wealth and not return from that with anything."