God was born and became man

And Trypho said, “You endeavor to prove an incredible and well-nigh impossible thing; [namely], that God endured to be born and become man.” “If I undertook,” said I, “to prove this by doctrines or arguments of man, you should not bear with me. But if I quote frequently Scriptures, and so many of them, referring to this point, and ask you to comprehend them, you are hard-hearted in the recognition of the mind and will of God.

Justin Martyr
Dialogue with Trypho
Chapter LXVIII

God the Word was born of Mary

Mary then did truly conceive a body which had God inhabiting it. And God the Word was truly born of the Virgin, having clothed Himself with a body of like passions with our own. He who forms all men in the womb, was Himself really in the womb, and made for Himself a body of the seed of the Virgin, but without any intercourse of man.

Ignatius of Antioch
Epistle to the Trallians
Chapter X

God manifested in human form

Hence every kind of magic was destroyed, and every bond of wickedness disappeared; ignorance was removed, and the old kingdom abolished, God Himself being manifested in human form for the renewal of eternal life. And now that took a beginning which had been prepared by God. Henceforth all things were in a state of tumult, because He mediated the abolition of death.

Ignatius of Antioch
Epistle to the Ephesians
Chapter XIX

Jesus — the only true God

But our Physician is the only true God, the unbegotten and unapproachable, the Lord of all, the Father and Begetter of the only-begotten Son. We have also as a Physician the Lord our God, Jesus the Christ, the only-begotten Son and Word, before time began, but who afterwards became also man, of Mary the virgin. For “the Word was made flesh.” Being incorporeal, He was in the body; being impassible, He was in a passible body; being immortal, He was in a mortal body; being life, He became subject to corruption, that He might free our souls from death and corruption, and heal them, and might restore them to health, when they were diseased with ungodliness and wicked lusts.

Ignatius of Antioch
Epistle to the Ephesians
Chapter VII