John Wesley on Exodus 34:11

Observe that which I command thee - We cannot expect the benefit of the promises, unless we make conscience of the precepts. The two great precepts are, Thou shalt worship no other gods - A good reason is annexed; for the Lord, whose name is Jealous, is a jealous God - As tender in the matters of his worship as the husband is of the honour of the marriage - bed. Thou shalt make thee no molten gods - Thou shalt not worship the true God by images. This was the sin they had lately fallen into, which therefore they are particularly cautioned against. That they might not be tempted to worship other gods, they must not join in affinity or friendship with those that did.