'Eighth' in the Bible

On the eighth day they held a solemn assembly: for they kept the dedication of the altar seven days, and the feast seven days.

Now they began on the first [day] of the first month to sanctify, and on the eighth day of the month came they to the porch of Yahweh; and they sanctified the house of Yahweh in eight days: and on the sixteenth day of the first month they made an end.

For in the eighth year of his reign, while he was yet young, he began to seek after the God of David his father; and in the twelfth year he began to purge Judah and Jerusalem from the high places, and the Asherim, and the engraved images, and the molten images.