'Beast's' in the Bible

“No one is so fierce [and foolhardy] that he dares to stir up Leviathan;Who then is he who can stand before Me [or dares to contend with Me, the beast’s creator]?

“He looks on everything that is high [without terror];He is monarch over all the sons of pride. [And now, Job, who are you who does not dare to disturb the beast, yet who dares resist Me, the beast’s creator? Everything under the heavens is Mine; therefore, who can have a claim against God?]”

Let his heart be changed from man's, and let a beast's heart be given unto him; and let seven times pass over him.

One of the beast's heads looked like it had sustained a mortal wound, but its fatal wound was healed. Rapt with amazement, the whole world followed the beast.

And he is given power to give breath to the image of the beast, so that the image of the beast will even [appear to] speak, and cause those who do not bow down and worship the image of the beast to be put to death.

so that no one can buy or sell unless he has the mark: the beast’s name or the number of his name.

This calls for wisdom: Let the one who has insight calculate the beast's number, for it is man's number, and his number is 666.

Then another angel, a third one, followed them, saying with a loud voice, “Whoever worships the beast and his image and receives the mark [of the beast] on his forehead or on his hand,

Then I saw three unclean spirits like frogs coming from the dragon’s mouth, from the beast’s mouth, and from the mouth of the false prophet.