Actions in the Old Testament have not only tense, mood and voice. They have stems (7 or 8 of them!) that each arranges the subjects in a unique relation to the action. For example the stems of to walk (halak) can mean (a) walk, (b) walk about, (c) make [someone or something] go [away], and (d) go to and fro. In Exodus 3:8 the Lord is causing the deliverance and the ascent from Egypt.
The causation plays out either in the action or the outcome. The deliverance and ascent of Exodus 3:8 are action causatives. It was Moses and Joshua who were God’s agents on the ground delivering and conveying.
and I have come down to deliver them out of the hand of the Egyptians and to bring them up out of that land to a good and broad land, a land flowing with milk and honey, to the place of the Canaanites, the Hittites, the Amorites, the Perizzites, the Hivites, and the Jebusites. Exod 3:8
We know that the personal arrival of God did not occur until the Word became flesh and live among us, so “I have come down” is to be understood in limited sense in that the interactions are accomplished through human or angelic agents.
Christ had no helpers in atoning for human rebellion. He was all alone in the passion, resurrection and exaltation.
Who have received the law by the disposition of angels, and have not kept it. Acts 7:53
Why then the law? It was added because of transgressions, until the offspring should come to whom the promise had been made, and it was put in place through angels by an intermediary. Gal 3:19