'Seal' in the Bible

Then when the Lamb opened the second seal, I heard the second living creature saying, "Come!"

Then when the Lamb opened the third seal I heard the third living creature saying, "Come!" So I looked, and here came a black horse! The one who rode it had a balance scale in his hand.

Then when the Lamb opened the fourth seal I heard the voice of the fourth living creature saying, "Come!"

Now when the Lamb opened the fifth seal, I saw under the altar the souls of those who had been violently killed because of the word of God and because of the testimony they had given.

Then I looked when the Lamb opened the sixth seal, and a huge earthquake took place; the sun became as black as sackcloth made of hair, and the full moon became blood red;

Then I saw another angel ascending from the east, who had the seal of the living God. He shouted out with a loud voice to the four angels who had been given permission to damage the earth and the sea:

"Do not damage the earth or the sea or the trees until we have put a seal on the foreheads of the servants of our God."

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:

Now when the Lamb opened the seventh seal there was silence in heaven for about half an hour.

They were told not to damage the grass of the earth, or any green plant or tree, but only those people who did not have the seal of God on their forehead.

When the seven thunders spoke, I was preparing to write, but just then I heard a voice from heaven say, "Seal up what the seven thunders spoke and do not write it down."

Then he said to me, "Do not seal up the words of the prophecy contained in this book, because the time is near.