Parashas Ki Sisa · Passuk 34:15
Torah Temimah points to classical source on this unit (verified).
English: “Lest you make a covenant” — prohibition of covenant with idolaters.
Derash warning against covenant and shared worship with the land’s inhabitants.
Lest you make a covenant with the inhabitant of the land, and they go astray after their gods and sacrifice to their gods, and he call you and you eat of his sacrifice.