The only descendant of Abraham who has brought forgiveness of sins to the world is, of course, Jesus, and the New Testament commentary on the promises to Abraham provides solid support:-
Mtoto pekee wa Abrahamu aliyeleta msamaha wa dhambi za ulimwengu, kwa kweli ni yesu, na ufafanuzi wa Agano Jipya juu ya Ahadi zilizofanywa kwa Abrahamu unatoa msaada madhubuti: -