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https://www.thegospelcoalition.org/essay/trinitarianism-in-the-early-church/
Ignatius of Antioch, AD 110
Our God, Jesus Christ, was, according to the appointment of God, conceived in the womb by Mary, of the seed of David, but by the Holy Spirit. (Letter to the Ephesians 18)
Ignatius … to the church of God the Most High Father and his beloved Son, Jesus Christ, … I glorify God, even Jesus Christ, who has given you such wisdom … (Letter to the Smyrneans intro-ch. 1)
Anonymous, Letter to Diognetus, AD 80 - 130
This is he who was from the beginning, who appeared as if new, and was found old, and yet who is ever born afresh in the hearts of the saints. This is he who, being from everlasting, is today called the Son. (Letter to Diognetus 11)
Justin Martyr, c. AD 150
"No one knows the Father but the Son, nor the Son but the Father, and those to whom the Son will reveal him" [Matt. 21:27]. The Jews, accordingly, being are throughout of the opinion that it was the Father of the universe who spoke to Moses [in the burning bush], though the One who spoke to him was the Son of God. … They are justly charged, both by the Spirit of Prophecy and by Christ himself, with knowing neither the Father nor the Son. Those who affirm that the Son is the Father are proven neither to be acquainted with the Father nor to know that the Father has a Son. The Son, being the first-begotten Word of God, is God. Of old he appeared in the shape of and in the likeness of an angel to Moses and other prophets, but now in the time of your reign [i.e., during the Roman empire] … he became man by a virgin … for the salvation of those who believe in him. (First Apology 63).
There is then brought to the president of the brethren [I think this refers to whoever is presiding at a meeting, but no one knows for certain] bread and a cup of wine mixed with water. He takes them, gives praise and glory to the Father of the universe through the name of the Son and of the Holy Spirit, and offers thanks at considerable length for our being counted worthy to receive these things at his hands. (First Apology 65)
Leningrad Codex of the Hebrew Scriptures
Leningrad Codex of the Hebrew Scriptures
For all things with which we are supplied, we bless the Maker of all through his Son Jesus Christ and through the Holy Spirit. (First Apology 67)
But to the Father of all, who is unbegotten, there is no name given. .. And His Son, who alone is properly called Son, the Word who also was with him and was begotten before the works, when at first He created and arranged all things by Him, is called Christ, in reference to His being anointed and Godís ordering all things through him. (Second Apology 6)
Our Saviour Jesus Christ … being the Word of God, inseparable from Him in power, having assumed [the form of] man, who had been made in the image and likeness of God, restored to us the knowledge of the religion of our ancient forefathers. (Hortatory Address to the Greeks 38)
Permit me first to recount the prophecies, which I wish to do in order to prove that Christ is called both God and Lord of hosts and Jacob in parable by the Holy Spirit. (Dialogue with Trypho 36)
[Trypho the Jew speaking to Justin about Christians in general] Trypho said, " … You utter many blasphemies. You're attempting to persuade us that this crucified man was with Moses and Aaron, spoke to them in the pillar of the cloud, became crucified, ascended up to heaven, will come again to earth, and ought to be worshiped!"
Then I answered, "I know that, as the word of God says, this great wisdom of God, the Maker of all things, and the Almighty, is hidden from you." (Dialogue with Trypho 38)
In the fourty-fourth Psalm [LXX, in our Masoretic text, it's the 45th], these words are … referred to Christ: "My heart has brought forth a good Word" [v. 1, considered by the early Christians to be a reference to the birth of the Son/Word in eternity past]. (Dialogue with Trypho 38)
God begat before all creatures a Beginning, [who was] a certain rational power [proceeding] from Himself, who is called by the Holy Spirit, now the Glory of the Lord, now the Son, again Wisdom, again an Angel, then God, and then Lord and Logos; and on another occasion He calls Himself Captain, when He appeared in human form to Joshua the son of Nave (Nun). For He can be called by all those names, since He ministers to the Father’s will, and since He was begotten of the Father by an act of will; just as we see happening among ourselves: for when we give out some word, we beget the word; yet not by abscission, so as to lessen the word [which remains] in us, when we give it out: and just as we see also happening in the case of a fire, which is not lessened when it has kindled [another], but remains the same; and that which has been kindled by it likewise appears to exist by itself, not diminishing that from which it was kindled. The Word of Wisdom, who is Himself this God begotten of the Father of all things, and Word, and Wisdom, and Power, and the Glory of the Begetter, will bear evidence to me, when He speaks by Solomon the following: "If I shall declare to you what happens daily, I shall call to mind events from everlasting, and review them. The Lord made me the beginning of His ways for His works. From everlasting He established me in the beginning, before He had made the earth, and before He had made the deeps, before the springs of the waters had issued forth, before the mountains had been established ... [Prov. 8:22ff]. (Dialogue with Trypho 61)
Since we find it recorded in the memoirs of the apostles that he is the Son of God, and since we call him the Son, we have understood that he proceeded before all creatures from the Father by his power and his will ... and that he became man by the virgin, in order that the disobedience which proceeded from the serpent might receive its destruction in the same way in which it derived its origin. (Dialogue with Trypho 100)
For I have already proved that he was the only-begotten of the Father in everything, being begotten, in a unique way, Logos and Power by him, and afterwards become man through the virgin, as we have learned from the memoirs [of the apostles]. (Dialogue with Trypho 105)
Hermas, AD 100 - 160
"First of all, sir," I said, "Explain to me what is the meaning of the rock and the gate?"
"This rock," he answered, "and this gate are the Son of God."
"How, sir?" I said. "The rock is old, and the gate is new."
"Listen," he said, "and understand, O ignorant man. The Son of God is older than all his creatures, so that he was a fellow counselor with the Father in his work of creation. For this reason he is old."
"And why is the gate new, sir?" I said.
"Because," he answered, "he became manifest in the last days of the dispensation. For this reason the gate was made new, that they who are to be saved by it might enter into the kingdom of God." (Shepherd of Hermas III:9:12)
