'Joined' in the Bible

The people joined the Baal-peor cult. As a result, the anger of the LORD flared up against Israel,

Then Moses ordered the judges of Israel, "Each one of you is to execute the men in his own tribe who joined the Baal-peor cult."

The descendants of Eliab were Nemuel, Dathan, and Abiram. Dathan and Abiram were removed from the community because they joined the rebellion against Moses and Aaron, as did Korah's company when they rebelled against the LORD.