Exodus 3:4 (BSB)

When the LORD saw that he had gone over to look, God called out to him from within the bush, “Moses, Moses!” “Here I am,” he answered.

From Exodus 3. Also in the ESV.

Commentary on Exodus 3:4

• John Calvin (Reformed), Calvin's Commentaries on Exodus 3:4: 4. God called unto him out of the midst of the bush. In the first place, my readers will observe that, as is the case in almost all visions, it was not a voiceless spectacle to alarm the holy man, but that instruction accompanied it by which his mind might obtain encouragement.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Exodus 3:1-6: The years of the life of Moses are remarkably divided into three forties: the first forty he spent as a prince in Pharaoh's court, the second a shepherd in Midian, the third a king in Jeshurun; so changeable is the life of men, especially the life of good men. He had now finished his second forty, when he received his commission to bring Israel out of Egypt.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Exodus 3:4: And when the Lord saw that he turned aside to see,.... Who is before called the Angel of the Lord, here Jehovah, the omniscient and omnipresent Being, who observing Moses turning aside and going onward to gratify his curiosity, by examining more narrowly this strange phenomenon: God called unto him out of the midst of the bush; with an articulate voice, being the eternal Word...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Exodus 3:4: when the Lord saw that he turned aside to see--The manifestations which God anciently made of Himself were always accompanied by clear, unmistakable signs that the communications were really from heaven. This certain evidence was given to Moses. He saw a fire, but no human agent to kindle it; he heard a voice, but no human lips from which it came; he saw no living...