Another good example is this vision given to Ezekiel where all the Jews were killed except those who had the mark:
Originally Posted by duxrow
Ezekiel 9:4 And the LORD said unto him, Go through the midst of the city, through the midst of Jerusalem, and set a mark upon the foreheads of the men that sigh and that cry for all the abominations that be done in the midst thereof. 5 And to the others he said in mine hearing, Go ye after him through the city, and smite: let not your eye spare, neither have ye pity: 6 Slay utterly old and young, both maids, and little children, and women: but come not near any man upon whom is the mark; and begin at my sanctuary. Then they began at the ancient men which were before the house. The symbolism seems pretty clear. We need to remember that Revelation is a vision with symbolic meaning, not a screenplay for future events.