"They answered and said to Him, 'Abraham is our father.' Jesus said to them, 'If you were Abraham’s children, you would do the works of Abraham.'" John 8.39
The children of Abraham do the works of Abraham. Those who make excuses to avoid Abraham's example of sacrificial obedience have nothing to do with him.
In other words, Jesus is saying that anyone who does not imitate Abraham is not his child in faith.
