'Sacrificial' in the Bible

Then two hundred men from Jerusalem who were invited [as guests to his sacrificial feast] went with Absalom. They went innocently and knew nothing [about his plan against David].

Absalom also sent for Ahithophel the Gilonite, David's counselor, to come from his home town of Giloh while Absalom was presenting the sacrificial offerings. And so the conspiracy widened, because the common people increasingly sided with Absalom.