'Four' in the Bible

Then I looked up, and saw four horns (powers)!

Then the Lord showed me four craftsmen.

“Hear this! Flee from [Babylon] the land of the north [which shall come under judgment],” declares the Lord, “for I have scattered you like the four winds of the heavens,” declares the Lord.

Now again I looked up, and four chariots were coming out from between two mountains; and the mountains were mountains of [firm, immovable] bronze (divine judgment).

The angel answered me, “These are the four spirits of the heavens, which go out after presenting themselves before the Lord of all the earth,