I vaguely remember seeing one SF episode many many years ago. It was something on conquering alien race coming to earth.

In this episode one of the priests brought a bible to the alien race on their mother space ship, trying to convince them to adopt a peaceful way. Alien commander enjoyed reading the bible, but the only conclusion he got is that enemies need to be crushed hard, which clearly was not the priest intention. Unfortunately I can't remember anything else.

Can someone tell me what series title was?