'Seal' in the Bible
Bestow your pains not on the food which perishes, but on the food that remains unto the Life of the Ages--that food which will be the Son of Man's gift to you; for on Him the Father, God, has set His seal."
If to other men I am not an Apostle, yet at any rate I am one to you; for your very existence as a Christian Church is the seal of my Apostleship.
and He has also set His seal upon us, and has put His Spirit into our hearts as a pledge and foretaste of future blessing.
And when the Lamb broke the second seal, I heard the second living creature say, "Come."
When the Lamb broke the third seal, I heard the third living creature say, "Come." I looked, and a black horse appeared, its rider carrying a balance in his hand.
When the Lamb broke the fourth seal I heard the voice of the fourth living creature say, "Come."
When the Lamb broke the fifth seal, I saw at the foot of the altar the souls of those whose lives had been sacrificed because of the word of God and of the testimony which they had given.
When the Lamb broke the sixth seal I looked, and there was a great earthquake, and the sun became as dark as sackcloth, and the whole disc of the moon became like blood.
And I saw another angel coming from the east and carrying a seal belonging to the ever-living God. He called in a loud voice to the four angels whose work it was to injure the earth and the sea.
When the Lamb broke the seventh seal, there was silence in Heaven for about half an hour.
And they were forbidden to injure the herbage of the earth, or any green thing, or any tree. They were only to injure human beings--those who have not the seal of God on their foreheads.
They have power given to them to seal up the sky, so that no rain may fall so long as they continue to prophesy; and power over the waters to turn them into blood, and to smite the earth with various plagues whenever they choose to do so.
He closed the entrance and put a seal upon him in order that he might be unable to lead the nations astray any more until the thousand years were at an end. Afterwards he is to be set at liberty for a short time.