Samuel Clarke says in The Scripture Doctrine of the Trinity,
“And Cyril of Jerusalem, speaking of this very passage in Esaias, where he saw God sitting upon the Throne of his glory: The Father (saith he) hath no man seen at any time; but he which then appeared to the Prophets, was the Son….Thus when ‘tis said of Moses and the seventy Elders Exod. xxiv, 10, that they saw the God of Israel, and that there was under his feet as it were a paved work, etc. it must be understood that they saw, not the Invisible Father, but the Son appearing in the Name and Person of the Father.
All which, is much confirmed by St. Stephen’s Expression, Acts vii; 30, 32, that the ANGEL of the Lord [viz. the Angel of the Covenant, the Angel of his Presence, whom the Name of God was, and by whom God always speaks, upon which account he is stiled the Word of God] appeared to Moses in the Wilderness in a flame of Fire in a Bush;—stating, I AM the God of the Fathers, the God of Abraham, the God of Isaac, and the God of Jacob.” Pg. 104-105
This is what we read in Acts 7:
30 “After forty years had passed, an angel appeared to him in the wilderness of Mount Sinai, in the flame of a burning thorn bush.31 When Moses saw it, he marveled at the sight; and as he approached to look more closely, there came the voice of the Lord: 32 ‘I am the God of your fathers, the God of Abraham and Isaac and Jacob.’ Moses shook with fear and would not venture to look. 33 But the Lord said to him, ‘Take off the sandals from your feet, for the place on which you are standing is holy ground. 34 I have certainly seen the oppression of My people in Egypt and have heard their groans, and I have come down to rescue them; come now, and I will send you to Egypt.’
Yet we read in Exodus 3:7 that Jehovah is speaking. However, from verse 2 we know that it was not the person of Jehovah speaking but the angel of Jehovah. Here we see how the Word of God is identified with the Father with reference to Nominal Numerics not Cardinal Numerics. With reference to Cardinal Numerics the two persons are distinct. With reference to Nominal Numerics, the Word speaks for the Father as if the two were wearing the same jersey or as Clarke puts it that the Word appears in the name, or bore the name of the Father in the economia.