Numbers 25:1-3 NIV

[1] While Israel was staying in Shittim, the men began to indulge in sexual immorality with Moabite women, [2] who invited them to the sacrifices to their gods. The people ate the sacrificial meal and bowed down before these gods. [3] So Israel yoked themselves to the Baal of Peor. And the LORD’s anger burned against them.