'Eighth' in the Bible

On the eighth day he shall bring two turtledoves or two young pigeons to the priest, to the doorway of the Tent of Meeting (tabernacle).

On the eighth day [it was] Gamaliel the son of Pedahzur, leader [of the tribe] of the sons of Manasseh [who presented his offering];

‘On the eighth day you shall have a solemn assembly [to mark the end of the feast]; you shall do no laborious work.