'Foreheads' in the Bible
Behold, I have made your face hard against their faces, and your forehead hard against their foreheads.
Yahweh said to him, Go through the midst of the city, through the midst of Jerusalem, and set a mark on the foreheads of the men that sigh and that cry over all the abominations that are done in its midst.
saying, "Don't harm the earth, neither the sea, nor the trees, until we have sealed the bondservants of our God on their foreheads!"
They were told that they should not hurt the grass of the earth, neither any green thing, neither any tree, but only those people who don't have God's seal on their foreheads.
He causes all, the small and the great, the rich and the poor, and the free and the slave, to be given marks on their right hands, or on their foreheads;
I saw, and behold, the Lamb standing on Mount Zion, and with him a number, one hundred forty-four thousand, having his name, and the name of his Father, written on their foreheads.