'Knew' in the Bible

And recognizing the grace [that God had] bestowed on me, James and Cephas (Peter) and John, who were reputed to be pillars [of the Jerusalem church], gave to me and Barnabas the right hand of fellowship, so that we could go to the Gentiles [with their blessing] and they to the circumcised (Jews).

Howbeit then, when ye knew not God, ye did service unto them which by nature are no gods.