And it came to pass after these things, that Isaac and Ishmael were disputing. Ishmael said: ‘It is right for me to be the heir of my father, since I am his first-born son.’ But Isaac said: ‘It is right for me to be the heir of my father, since I am the son of Sarah his wife, but you are the son of Hagar, the handmaid of my mother.’ Ishmael answered and said: ‘I am more righteous than you because I was circumcised when thirteen years old; and if it had been my wish to refuse I would not have handed myself over to be circumcised.’ Isaac answered and said: ‘Am I not now thirty-seven years old? If the Holy One, blessed be he, demanded all my members I would not hesitate.’ Immediately, these words were heard before the Lord of the universe, and immediately, the word of the Lord tested Abraham, and said unto him, ‘Abraham’; and he said, ‘Here am I’.

And he said, ‘Take now thy son, thine only son, whom thou lovest, even Isaac, and get thee into the land of worship; and offer him there for a burnt offering upon one of the mountains which I will tell thee of’.