Of olive oil, Heb. of the olive tree of oil, i.e. not of wild and barren, but of fruitful olive trees, which yield plenty of oil.
Related Commentaries of Deuteronomy 8:8
Deuteronomy 8:8
8 A land of wheat, and barley, and vines, and fig trees, and pomegranates; a land of oila olive, and honey;