The Council of Ephesus (431 AD)

Whosoever shall say that it is not the divine Word himself, when he was made flesh and had become man as we are, but another than he, a man born of a woman, yet different from him (ἰδικῶς ἄνθρωπον), who is become our Great High Priest and Apostle; or if any man shall say that he offered himself in sacrifice for himself and not rather for us, whereas, being without sin, he had no need of offering or sacrifice: let him be anathema.

If any one maintains that the Word, who is from the beginning, has become the high priest and apostle of our confession, and has offered himself for us, and does not rather say that it is the work of Emmanuel to be an apostle; and if any one in such a manner divides the sacrifice between him who united [the Word] and him who was united [the manhood] referring it to a common sonship, that is, not giving to God that which is God’s, and to man that which is man’s; let him be anathema.