Abraham is first mentioned in the Old Testament.
Abraham is an Old Testament patriarch. He is not canonized nor does he have the title of saint. That term is usually reserved for New Testament personages.
Twelve New Testament Books mention Abraham.
The Old Testament.
New Testament
Yes the stories of jacob and Esau are in the old testament, as they were twins born to Isaac , the son of Abraham in genesis.
New Testament
Sarah is found in the Old Testament, specifically the book of Genesis. She is known specifically for her role as the wife of Abraham, and the mother of Isaac.
My favorite chapter Proverbs in the Old Testament.
Jesus was in the new testament and not the old testament.
The value of the Old Testament is to allow us to understand the New Testament. The Old Testament points to the New Testament and shows us why we need a savior.
The New Testament. All gospels are in the New Testament.
It is the first book in the New Testament.