'Eight' in the Bible

Throughout your generations, every male among you at eight days old is to be circumcised. This includes a slave born in your house and one purchased with money from any foreigner. The one who is not your offspring,

When his son Isaac was eight days old, Abraham circumcised him, as God had commanded him.

And Bethuel fathered Rebekah. Milcah bore these eight to Nahor, Abraham’s brother.