“They answered and said unto him, Abraham is our father. Jesus saith unto them, If ye were Abraham’s children, ye would do the works of Abraham.”
John 8:39 — Greek Interlinear
Church Fathers on John 8:39
The Jews had asserted they were free, because they were Abraham’s seed. Our Lord replies, I know that you are Abraham’s seed; as if to say, I know that you are the sons of Abraham, but according to the flesh, not spiritually and by faith. So He adds, But you seek to kill Me.
He says this, that they might not attempt to answer, that they had no sin. He reminds them of a present sin; a sin which they had been meditating for some time past, and which was actually at this moment in their thoughts: putting out of the question their general course of life. He thus removes them by degrees out of their relationship to Abraham, teaching them not to pride themselves so much upon it: for that, as bondage and freedom were the consequences of works, so was…
whereas men, to whom the revelation is made, were not witnesses.