'Grass' in the Bible

The first angel blew his trumpet, and hail and fire, mixed with blood, were hurled to the earth. So a third of the earth was burned up, a third of the trees were burned up, and all the green grass was burned up.

They were told not to harm the grass of the earth, or any green plant, or any tree, but only people who do not have God’s seal on their foreheads.