Matthew 28:19 by "Church Fathers" and Eusebius BEFORE Nicaea, 325 AD.

 Go and baptize in the name of the Father, and the Son and the Holy Spirit

1. Didache 7;cp. 9:5 "in the name of the Lord" (c. 50-90 A.D.)
2. Justin Martyr, First Apology (c. 155 A.D.) For, in the name of God, the Father and Lord of the universe, and of our Saviour Jesus Christ, and of the Holy Spirit, they then receive the washing with water...
3. Tatian, Diatessaron (c. 170-175 A.D.)
4. Irenaus, Against Heresies (c. 190 A.D.)
5. Tertullian, On Baptism (c. 200 A.D.)
6. Hipollytus, Against the Heresy of One Noetus (c. 230 A.D.)
7. Origen, Commentary on Romans (c. 244 A.D.)
8. Xanthippe and Polyxena, Acts of Xanthippe and Polyxena (c. 250 A.D.)
9. Gregory Thaumaturgus, Sectional Confession of Faith (c. 250 A.D.)
10. Cyprian, Epistle to Jubaianus (c. 256 A.D.)
11. Dionysius of Alexandria, letter to Xystus of Rome (c. 257 A.D.)
12. Victorinus, Commentary on the Apocalypse of the Blessed John (c. 300 A.D.)

Eusebius of Caesarea, who was "Arian," i.e., unitarian! 

1. Theophania, book 4 (date unknown)
2. Letter on the Council of Nicaea to Caesarea (c. 325 A.D.)
3. Against Marcellus  book 1 (c. 335 A.D.)
4. Ecclesiastical Theology, book 3 (c. 335 A.D.)