19. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn Isma’il ibn Bazi’ from Hannan ibn Sadir from his father who has said the following: “I asked abu Ja’far ‘Can a son pay back (for the favors of) a father?’ The Imam said, ‘There is no payment for him except two things: if the father is a slave and the son buys him and sets him free, or the father is in debt and the son pays it off.’”