Adam Clarke on Deuteronomy 32:13

He made him ride - ירכבהו yarkibehu, he will cause him to ride. All the verbs here are in the future tense, because this is a prophecy of the prosperity they should possess in the promised land. The Israelites were to ride - exult, on the high places, the mountains and hills of their land, in which they are promised the highest degrees of prosperity; as even the rocky part of the country should be rendered fertile by the peculiar benediction of God.

Suck honey out of the rock, and oil out of the flinty rock - This promise states that even the most barren places in the country should yield an abundance of aromatic flowers, from which the bees should collect honey in abundance; and even the tops of the rocks afford sufficient support for olive trees, from the fruit of which they should extract oil in abundance: and all this should be occasioned by the peculiar blessing of God upon the land.