What does Numbers 25:18 mean?

Numbers 25:18 comes at the close of a dark and violent chapter in Israel's wilderness journey. In plain language, the verse explains why God commands Israel to treat the Midianites as enemies: the Midianites had deliberately used cunning and seduction to lure Israel into idolatry and sexual immorality, and this scheme had already led to devastating consequences, including a plague and the death of a Midianite woman named Cozbi, daughter of a Midianite chieftain, who had been executed for her role in the affair.

To understand the context, we need to back up to the earlier part of Numbers 25. As Israel camped near Moab, preparing to enter the Promised Land, the men began engaging in sexual immorality with Moabite and Midianite women, who then drew them into worshiping the Baal of Peor, a local Canaanite deity. This was not incidental temptation but a calculated strategy—earlier chapters (Numbers 31:16) reveal that this plan was advised by Balaam, the prophet who had been unable to curse Israel directly but found another way to bring them under judgment. God's anger burned against Israel, and a plague broke out, killing 24,000 people. The crisis was only halted when Phinehas, grandson of Aaron, took decisive action by killing an Israelite man and the Midianite woman Cozbi, who were flagrantly carrying on their liaison. Numbers 25:18 is God's explanation to Moses of why the Midianites, specifically, deserved retaliation—they had "harassed" Israel through dece