Now we believe that Christ did ever act in the name of God the Father; that He actually from the beginning held intercourse with (men); actually communed with patriarchs and prophets; was the Son of the Creator; was His Word; whom God made His Son by emitting Him from His own self, and thenceforth set Him over every dispensation and (administration of) His will, making Him a little lower than the angels, as is written in David.
…For even in the Old Testament He had declared, “No man shall see me, and live.” He means that the Father is invisible, in whose authority and in whose name was He God who appeared as the Son of God. But with us Christ is received in the person of Christ, because even in this manner is He our God.
Tertullian
The Five Books Against Marcion, Book II
Chapter XXVII