What does Exodus 34:12 mean?

He said, “If now I have found favor in your sight, Lord, please let the Lord go among us; although this is a stiff-necked people; pardon our iniquity and our sin, and take us for your inheritance.”

He said, “Behold, I make a covenant: before all your people I will do marvels, such as have not been worked in all the earth, nor in any nation; and all the people among which you are shall see the work of Yahweh; for it is an awesome thing that I do with you.

Observe that which I command you today. Behold, I drive out before you the Amorite, the Canaanite, the Hittite, the Perizzite, the Hivite, and the Jebusite.

but you shall break down their altars, and dash in pieces their pillars, and you shall cut down their Asherah poles;

for you shall worship no other god: for Yahweh, whose name is Jealous, is a jealous God.

“Don’t make a covenant with the inhabitants of the land, lest they play the prostitute after their gods, and sacrifice to their gods, and one call you and you eat of his sacrifice;