Charles Spurgeon Commentary John 8:40-41

"But now ye seek to kill me, a man that hath told you the truth, which I heard from God: this did not Abraham. Ye do the works of your father. They said unto him, We were not born of fornication; we have one Father, [even] God." — John 8:40-41 (ASV)

But now ye seek to kill me, a man that hath told you the truth, which I have heard of God: this did not Abraham. Ye do the deeds of your father.

He had not told them who that father was; but as it is a standing rule that men do the deeds of their father, the genuineness of the descent which they claimed could be tested by their likeness to their father.