Church Fathers on John 8:42
The Jews had begun to understand that our Lord was not speaking of sonship according to the flesh, but of manner of life. Scripture often speaks of spiritual fornication, with many gods, and of the soul being prostituted, as it were, by paying worship to false gods. This explains what follows: Then said they to Him, We be not born of fornication; we have one Father, even God.
As if their motive against Him was a desire to avenge God’s honor.
Or their sonship to Abraham having been disproved, they reply by bitterly insinuating, that our Savior was the offspring of adultery. But perhaps the tone of the answer is disputatious, more than any thing else. For whereas they have said shortly before, We have Abraham for our father, and had been told in reply, If you are Abraham’s children, do the works of Abraham; they declare in return that they have a greater Father than Abraham, i.e. God; and that they were not derived…