John the Apostle
Revelation 9:4BSB·traditional attribution

They were told not to harm the grass of the earth or any plant or tree, but only those who did not have the seal of God on their foreheads.

Matthew Henry Presbyterian @wholebiblehenry

Upon the sounding of this trumpet, the things to be observed are, 1. A star falling from heaven to the earth. Some think this star represents some eminent bishop in the Christian church, some angel of the church; for, in the same way of speaking by which pastors are called stars, the church is called heaven; but who this is expositors do not agree.

Commenting on Revelation 9:1-12

John Gill Reformed Baptist @doctorgill

And it was commanded them,.... The locusts, by Christ, who has a sovereign power over all men, and lays them under the restraints of his providence: that they should not hurt the grass of the earth: true Christians, private believers, it may be those of the lower class; who for their numbers, and for their flourishing estate under the dews of heavenly grace, and the...

Albert Barnes Presbyterian @notesbybarnes

Verse 4. And it was commanded them. The writer does not say by whom this command was given, but it is clearly by some one who had the direction of them. As they were evoked from the "bottomless pit" by one who had the key to that dark abode, and as they are represented in as under the command of one who is there called...