'Seals' in the Bible

[He is the one] who commands the sun, and it does not rise, {and he seals up the stars}.

And I saw in the right hand of the one who is seated on the throne a scroll, written inside and on the back, sealed up with seven seals.

And I saw a powerful angel proclaiming with a loud voice, "Who [is] worthy to open the scroll and to break its seals?"

And one of the elders said to me, "Do not weep! Behold, the lion of the tribe of Judah, the root of David, has conquered, so that he can open the scroll and its seven seals.

And they were singing a new song, saying, "You are worthy to take the scroll and to open its seals, because you were slaughtered, and bought [people] for God by your blood from every tribe and language and people and nation,

And I watched when the Lamb opened one of the seven seals, and I heard one of the four living creatures saying like the sound of thunder, "Come!"