'Seven' in the Bible

They observed the Feast of Unleavened Bread for seven days with joy, for the Lord had caused them to rejoice and had turned the heart of the king of Assyria toward them, so that he encouraged them and strengthened their hands in the work of the house of God, the God of Israel.

For you are sent by the king and his seven advisers to inquire about Judah and Jerusalem in accordance with the Law of your God, which is in your hand,