'Seal' in the Bible

And when it opened the second seal, I heard the second living creature saying, Come and see.

And when it opened the third seal, I heard the third living creature saying, Come and see. And I saw: and behold, a black horse, and he that sat upon it having a balance in his hand.

And when it opened the fourth seal, I heard the voice of the fourth living creature saying, Come and see.

And when it opened the fifth seal, I saw underneath the altar the souls of them that had been slain for the word of God, and for the testimony which they held;

And I saw when it opened the sixth seal, and there was a great earthquake; and the sun became black as hair sackcloth, and the whole moon became as blood,

And I saw another angel ascending from the sunrising, having the seal of the living God; and he cried with a loud voice to the four angels to whom it had been given to hurt the earth and the sea,

And when it opened the seventh seal, there was silence in the heaven about half an hour.

and it was said to them, that they should not injure the grass of the earth, nor any green thing, nor any tree, but the men who have not the seal of God on their foreheads:

And when the seven thunders spoke, I was about to write: and I heard a voice out of the heaven saying, Seal the things which the seven thunders have spoken, and write them not.

And he says to me, Seal not the words of the prophecy of this book. The time is near.