If the Gentiles have been made partakers of their spiritual things-- Rom 15.
Sometimes followed by in.
Wish me partaker in thy happiness--
If we had been in the days of our fathers, we would not have been partakers with them in the blood of the prophets. Mat 23.
1. An accomplice; an associate.
When thou sawest a thief,thou consentedst with him, and hast been partaker with adulterers. Psa 1.