Worship of idols was prohibited, particularly the idols of the peoples into whose lands the Israelites were going. A key part of this restriction was the ban on treaties, or covenants, with these idol-worshiping peoples. Making a treaty would mean acknowledging their gods, as ancient treaties often called upon gods as witnesses (see study note on 20:1–23:33).
The treaties would also tempt the Israelites to adopt the customs of their treaty partners (34:12, 15–16).