'Seven' in the Bible

They observed the Feast of Unleavened Bread for seven days with joy, for the Lord had given them joy and had changed the opinion of the king of Assyria toward them, so that he assisted them in the work on the temple of God, the God of Israel.

You are authorized by the king and his seven advisers to inquire concerning Judah and Jerusalem, according to the law of your God which is in your possession,