'Marked' in the Bible

"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."

Now I heard the number of those who were marked with the seal, one hundred and forty-four thousand, sealed from all the tribes of the people of Israel:

Twelve thousand were sealed from the tribe of Judah, twelve thousand from the tribe of Reuben, twelve thousand from the tribe of Gad,

Of the tribe of Zebulun twelve thousand: of the tribe of Joseph twelve thousand: of the tribe of Benjamin were marked twelve thousand.

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,

And I saw the Lamb on the mountain of Zion, and with him a hundred and forty-four thousand, marked on their brows with his name and the name of his Father.

So the first angel went and poured out his bowl on the earth; and loathsome and malignant sores came on the people who had the mark of the beast and who worshiped his image.

These will make war against the Lamb, and the Lamb will overcome them, because he is the Lord of lords and King of kings; and those who are with him are named, marked out, and true.