Since The Father can’t be seen (only Jesus has seen The Father-Jn. 6.46: No one has seen the Father except the one who is from God; only he has seen the Father-NIV).
Also no one is able to approach God except The Son Whom The Father will send a second time: “In the sight of God, who gives life to everything, and of Christ Jesus… I charge you to keep this command without spot or blame until the appearing of our Lord Jesus Christ, which God will bring about in his own time—God, the blessed and only Ruler, the King of kings and Lord of lords, who alone is immortal and who lives in unapproachable light, whom no one has seen or can see. To him be honor and might forever. Amen” (1Tim. 6.13-16 NIV).
Here is a short article which notes the person of The Eternal Son acting in O.T. accounts.Where is the Angel of the Lord Found? | Ben Carlson – Covenant Baptist Theological Seminary