'Eighth' in the Bible

On the eighth day they held a celebration, for they had observed the dedication of the altar for seven days, and the feast for seven days.

Now they began the consecration on the first [day] of the first month, and on the eighth day of the month they came to the porch of the Lord. Then for eight days they consecrated the house of the Lord, and on the sixteenth day of the first month they finished.

For in the eighth year of his reign, while he was still young (sixteen), he began to seek after and inquire of the God of his father David; and in the twelfth year he began to purge Judah and Jerusalem of the high places, the Asherim, and the carved and cast images.