'Seals' in the Bible

Then He opens the ears of men,And seals their instruction,

“He seals the hand of every man,That all men may know His work.

I saw in the right hand of Him who sat on the throne a book written inside and on the back, sealed up with seven seals.

And I saw a strong angel proclaiming with a loud voice, “Who is worthy to open the book and to break its seals?”

and one of the elders *said to me, “Stop weeping; behold, the Lion that is from the tribe of Judah, the Root of David, has overcome so as to open the book and its seven seals.”

And they *sang a new song, saying, “Worthy are You to take the book and to break its seals; for You were slain, and purchased for God with Your blood men from every tribe and tongue and people and nation.

Then I saw when the Lamb broke one of the seven seals, and I heard one of the four living creatures saying as with a voice of thunder, “Come.”