'Joined' in the Bible

But bring with you also your brothers, the tribe of Levi, the tribe of your father (ancestor), so that they may join with you and serve you [as assistants], while you and your sons with you are before the Tent of the Testimony [the Holy Place where only priests may go, and the Most Holy Place which only the high priest may enter].

They shall join you and attend to the duties of the Tent of Meeting—all the service of the tent—and no stranger [no layman, anyone who is not a Levite] may approach you [and your sons].

So Israel joined themselves to Baal of Peor [in worship]. And the anger of the Lord was kindled against Israel.

So Moses said to the judges of Israel, “Each one of you must kill his men who have joined themselves to Baal of Peor [in worship].”