Therefore it is stated in the Book of the Wars of the LORD: “Waheb in Suphah and the wadis of the Arnon,
We have here an account of the several stages and removals of the children of Israel, till they came into the plains of Moab, out of which they at length passed over Jordan into Canaan, as we read in the beginning of Joshua. Natural motions are quicker the nearer they are to their centre.
Commenting on Numbers 21:10-20
And at the stream of the brooks that goeth down to the dwelling of Ar,.... All that part of the country which lay upon the stream, as far as the city of Ar, the metropolis of Moab, called Ar of Moab, Isa 15:1, and lieth upon the border of Moab; as that city did; so far goes the quotation out of the aforesaid book, as...
book of the wars of the Lord--A fragment or passage is here quoted from a poem or history of the wars of the Israelites, principally with a view to decide the position of Arnon.