6 And I heard what seemed to be a voice speaking in the midst of the four living creatures, and saying, "A quart of wheat for a shilling, and three quarts of barley for a shilling; but do not injure either the oil or the wine."
Revelation 6:6 Cross References - WNT
Revelation 4:6
6 And in front of the throne there seemed to be a sea of glass, resembling crystal. And midway between the throne and the Elders, and surrounding the throne, were four living creatures, full of eyes in front and behind.
Revelation 7:3
3 "Injure neither land nor sea nor trees," he said, "until we have sealed the bondservants of our God upon their foreheads."
Revelation 9:4
4 And they were forbidden to injure the herbage of the earth, or any green thing, or any tree. They were only to injure human beings--those who have not the seal of God on their foreheads.