'Seals' in the Bible

I saw, in the right hand of him who sat on the throne, a book written inside and outside, sealed shut with seven seals.

I saw a mighty angel proclaiming with a loud voice, "Who is worthy to open the book, and to break its seals?"

One of the elders said to me, "Don't weep. Behold, the Lion who is of the tribe of Judah, the Root of David, has overcome; he who opens the book and its seven seals."

They sang a new song, saying, "You are worthy to take the book, and to open its seals: for you were killed, and bought us for God with your blood, out of every tribe, language, people, and nation,

I saw that the Lamb opened one of the seven seals, and I heard one of the four living creatures saying, as with a voice of thunder, "Come and see!"