'Foreheads' in the Bible
"You are children of the LORD your God. You must not lacerate yourselves or shave your foreheads on account of the dead,
The LORD told him, "Go throughout the city of Jerusalem and put a mark on the foreheads of everyone who sighs and moans over all of the loathsome things that are happening in it."
"Don't harm the land, the sea, or the trees until we have marked the servants of our God with a seal on their foreheads."
They were told not to harm the grass on the earth, any green plant, or any tree. They could harm only the people who do not have the seal of God on their foreheads.
The second beast forces all people important and unimportant, rich and poor, free and slaves to be marked on their right hands or on their foreheads,
Then I looked, and there was the lamb, standing on Mount Zion! With him were 144,000 people who had his name and his Father's name written on their foreheads.
Then I saw thrones, and those who sat on them were given authority to judge. I also saw the souls of those who had been beheaded because of their testimony about Jesus and because of the word of God. They had not worshipped the beast or its image and had not received its mark on their foreheads or hands. They came back to life and ruled with the Messiah for a thousand years.
and see his face, and his name will be on their foreheads.