John 8:40

But now ye seek to kill Me, a man that hath told you the truth. (tom. xx. 11.) To kill Me, He says, a man. I say nothing now of the Son of God, nothing of the Word, because the Word cannot die; I speak only of that which ye see. It is in your power to kill that which you see, and offend Him Whom ye see not. This did not Abraham. (tom. xx. 12.) It might seem to some, that it were superfluous to say that Abraham did not this; for it were impossible that it should be; Christ was not born at that time. But we may remind them, that in Abraham's time there was a man born who spoke the truth, which he heard from God, and that this man's life was not sought for by Abraham. Know too that the Saints were never without the spiritual advent of Christ. I understand then from this passage, that every one who, after regeneration, and other divine graces bestowed upon him, commits sin, does by this return to evil incur the guilt of crucifying the Son of God, which Abraham did not do.

He here repeatedly handleth their murderous intention, and maketh mention of Abraham. And this He doth desiring to draw off their attention from this relationship, and to take away their excessive boasting, and also to persuade them no longer to rest their hopes of salvation in Abraham, nor in the relationship which is according to nature, but in that which is according to the will. For what hindered their coming to Christ was this, their deeming that relationship to be sufficient for them to salvation. But what is the "truth" of which He speaketh? That He is equal with the Father. For it was on this account that the Jews sought to slay Him; and He saith, "Ye seek to kill Me because I have told you the truth, which I have heard of My Father." To show that these things are not opposed to the Father, He again betaketh Himself to Him.

As if to say, By this you prove that you are not the sons of Abraham; that you do works contrary to those of Abraham.

"They said unto Him, Abraham is our father. Jesus saith unto them, If ye had Abraham to your father, ye would do the works of Abraham. But now ye seek to kill Me." He here repeatedly handleth their murderous intention, and maketh mention of Abraham. And this He doth desiring to draw off their attention from this relationship, and to take away their excessive boasting, and also to persuade them no longer to rest their hopes of salvation in Abraham, nor in the relationship which is according to nature, but in that which is according to the will. For what hindered their coming to Christ was this, their deeming that relationship to be sufficient for them to salvation. But what is the "truth" of which He speaketh? That He is equal with the Father. For it was on this account that the Jews sought to slay Him.

(Tr. xlii. 4) And yet He says above, I know that ye are Abraham's seed. So He does not deny their origin, but condemns their deeds. Their flesh was from him; their life was not.