When you say that this Christ existed as God before the ages..

And Trypho said, “We have heard what you think of these matters. Resume the discourse where you left off, and bring it to an end. For some of it appears to me to be paradoxical, and wholly incapable of proof. For when you say that this Christ existed as God before the ages, then that He submitted to be born and become man, yet that He is not man of man, this [assertion] appears to me to be not merely paradoxical, but also foolish.”

Justin Martyr
Dialogue with Trypho
Chapter XLVIII

Gentiles should not be forced to follow Jewish law

And Trypho again inquired, “But if some one, knowing that this is so, after he recognizes that this man is Christ, and has believed in and obeys Him, wishes, however, to observe these [institutions], will he be saved?” I said, “In my opinion, Trypho, such an one will be saved, if he does not strive in every way to persuade other men, —I mean those Gentiles who have been circumcised from error by Christ, to observe the same things as himself, telling them that they will not be saved unless they do so. This you did yourself at the commencement of the discourse, when you declared that I would not be saved unless I observe these institutions.”

Justin Martyr
Dialogue with Trypho
Chapter XLVII

Mary is the the end of the Old Covenant

“As, then, circumcision began with Abraham, and the Sabbath and sacrifices and offerings and feasts with Moses, and it has been proved they were enjoined on account of the hardness of your people’s heart, so it was necessary, in accordance with the Father’s will, that they should have an end in Him who was born of a virgin, of the family of Abraham and tribe of Judah, and of David…”

Justin Martyr
Dialogue with Trypho
Chapter XLIII

Eucharistic sacrifice prophesied in the Old Testament

“And the offering of fine flour, sirs,” I said, “which was prescribed to be presented on behalf of those purified from leprosy, was a type of the bread of the Eucharist, the celebration of which our Lord Jesus Christ prescribed, in remembrance of the suffering which He endured on behalf of those who are purified in soul from all iniquity, in order that we may at the same time thank God for having created the world, with all things therein, for the sake of man, and for delivering us from the evil in which we were, and for utterly overthrowing principalities and powers by Him who suffered according to His will. Hence God speaks by the mouth of Malachi, one of the twelve [prophets], as I said before, about the sacrifices at that time presented by you: ‘I have no pleasure in you, saith the Lord; and I will not accept your sacrifices at your hands: for, from the rising of the sun unto the going down of the same, My name has been glorified among the Gentiles, and in every place incense is offered to My name, and a pure offering: for My name is great among the Gentiles, saith the Lord: but ye profane it.” [So] He then speaks of those Gentiles, namely us, who in every place offer sacrifices to Him, i.e.,the bread of the Eucharist, and also the cup of the Eucharist, affirming both that we glorify His name, and that you profane [it].

Justin Martyr
Dialogue with Trypho
Chapter XLI

Trypho understands Justin worships Christ as the Yahweh of the Old Testament

And Trypho said, “…For you utter many blasphemies, in that you seek to persuade us that this crucified man was with Moses and Aaron, and spoke to them in the pillar of the cloud; then that he became man, was crucified, and ascended up to heaven, and comes again to earth, and ought to be worshipped.”

Justin Martyr
Dialogue with Trypho
Chapter XXXVIII

The God of Psalm 46 is Christ

“Moreover, in the diapsalm of the forty-sixth Psalm, reference is thus made to Christ: ‘God went up with a shout, the Lord with the sound of a trumpet. Sing ye to our God, sing ye: sing to our King, sing ye; for God is King of all the earth: sing with understanding. God has ruled over the nations. God sits upon His holy throne. The rulers of the nations were assembled along with the God of Abraham, for the strong ones of God are greatly exalted on the earth.’

Justin Martyr
Dialogue with Trypho
Chapter XXVII

Christ is King of Glory

Accordingly, it is shown that Solomon is not the Lord of hosts; but when our Christ rose from the dead and ascended to heaven, the rulers in heaven, under appointment of God, are commanded to open the gates of heaven, that He who is King of glory may enter in, and having ascended, may sit on the right hand of the Father until He make the enemies His footstool, as has been made manifest by another Psalm. For when the rulers of heaven saw Him of uncomely and dishonored appearance, and inglorious, not recognizing Him, they inquired, ‘Who is this King of glory?’ And the Holy Spirit, either from the person of His Father, or from His own person, answers them, ‘The Lord of hosts, He is this King of glory.’

Justin Martyr
Dialogue with Trypho
Chapter XXXVI