John 8:41

Ye do the works of your father. He persists in saying that they were not Abraham's children, but does not say whose children they were.

Then said they unto Him, We be not born of fornication, &c. Origen, Cyril, and Leontius think that in these words they implicitly reproached Him with His own birth. An atrocious statement, which the Pharisees studiously propagated, to detract from our Lord's credit and authority. But it would have been atrocious blasphemy. (2.) Euthymius and Rupertus suppose it to be only an assertion of their descent from Sarah, and not from Hagar, and thus not spurious, or in a secondary rank. (3.) We are not born of spiritual fornication, i.e., idolatry. We are not Hagarenes, who were idolaters. Rupertus objects that to make out this meaning the word "but" should have been inserted. But Maldonatus maintains that such particles are often omitted, adding that fornication in the prophets means idolatry, as being spiritual fornication, drawing away the soul from its true Spouse (see Hos 1:2). Theophylact explains it to mean, "We are not born of mixed marriages of Jews and Gentiles, which were forbidden, and counted illegitimate by the Jews." (4.) The Jews reply in a straightforward manner, Abraham is our true earthly father; and one is our Father, even God in heaven. Your charge is therefore false. You unjustly claim the God of Abraham for thyself alone, and exclude us from sonship with Him, and hand us over to another father, the devil, making us spurious, and consequently infamous.