John the Apostle
Revelation 18:4ESV·traditional attribution

Then I heard another voice from heaven saying, “Come out of her, my people, lest you take part in her sins, lest you share in her plagues;

Matthew Henry Presbyterian @wholebiblehenry

The downfall and destruction of Babylon form an event so fully determined in the counsels of God, and of such consequence to his interests and glory, that the visions and predictions concerning it are repeated. 1. Here is another angel sent from heaven, attended with great power and lustre, Rev 18:1.

Commenting on Revelation 18:1-8

John Gill Reformed Baptist @doctorgill

And I heard another voice from heaven,.... Either of another, or of the same angel, or rather of God, or Christ himself, since the persons addressed are called his people: saying, come out of her, my people; meaning either his elect ones, till now uncalled, being such whom God had chosen for his people, and were so by virtue of the covenant of grace, were...

Albert Barnes Presbyterian @notesbybarnes

Verse 4. And I heard another voice from heaven. He does not say whether this was the voice of an angel, but the idea seems rather to be that it is the voice of God. Come out of her, my people.