Revelation 9:4

“And it was commanded them, etc.] 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 distillations of the doctrine of grace, and the clear shining of the sun of righteousness upon them, and for their weakness, may be compared to grass; and yet as these being a company reserved by Christ for himself, who will not break nor bruise them, so neither will he suffer others to hurt them, and resents every offence done…”

“not hurt the grass . . . neither . . . green thing . . . neither . . . tree--the food on which they ordinarily prey. Therefore, not natural and ordinary locusts. Their natural instinct is supernaturally restrained to mark the judgment as altogether divine. those men which--Greek, "the men whosoever." in, &c.--Greek, "upon their forehead." Thus this fifth trumpet is proved to follow the sealing in Rev 7:1-8, under the sixth seal. None of the saints are hurt by these locusts, which is not true of the saints in Mohammed's attack, who is supposed by many to be meant by the locusts; for many true believers fell in the Mohammedan invasions of Christendom.”

“And it was commanded them - The writer does not say by whom this command was given, but it is clearly by someone 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 Revelation 9:11 as under the command of one who is there called Abaddon, or Apollyon - the Destroyer - it would seem most probable that the command referred to is one that is given by him; that is, that this expresses one of the principles on which he would act in his devastations. At all events, this denotes what would be one of the characteristics of these destroyers. Their purpose would be to vex and trouble people; not to spread…”

“And it was commanded them - By the secret power of God. Not to hurt the grass, neither any green thing, nor any tree - Neither those of low, middling, or high degree, but only such of them as were not sealed - Principally the unbelieving Israelites. But many who were called Christians suffered with them. Revelation 9:5”

“that they: Rev 6:6, Rev 7:3; Job 1:10, Job 1:12; Psa 76:10; Mat 24:24; Ti2 3:8, Ti2 3:9 hurt: Rev 8:7 but: Corrupt and idolatrous Christians; against whom the Saracens chiefly prevailed. which: Rev 7:3, Rev 7:4, Rev 14:1; Exo 12:23; Job 2:6; Eze 9:4, Eze 9:6; Eph 4:30 Revelation 9:5”