Wherefore, i.e; because the Amorites had wrested from Moab all to the north of Arnon. In the book of the wars of the Lord. Nothing is known of this book but what appears here. If it should seem strange that a book of this description should be already in existence, we must remember that amongst the multitude of Israel there must in the nature of things have been some "poets" in the then acceptation of the word.
Some songs there must have been, and those songs would be mainly inspired by the excitement and triumph of the final marches. The first flush of a new national life achieving its first victories over the national foe always finds expression in songs and odes.
It is abundantly evident from the foregoing narrative that writing of some sort was in common use at least among the leaders of Israel (see on Numbers 11:26), and they would not have thought it beneath them to collect these spontaneous effusions of a nation just awaking to the poetry of its own existence.
The archaic character of the fragments preserved in this chapter, which makes them sound so foreign to our ears, is a strong testimony to their genuineness. It is hardly credible that any one of a later generation should have cared either to compose or to quote snatches of song which, like dried flowers, have lost everything but scientific value in being detached from the soil which gave them birth.
What he did in the Red Sea, and in the brooks of Arnon. Rather, "Vaheb in whirlwind, and the brooks of Arnon." The strophe as cited here has neither nominative nor verb, and the sense can only be conjecturally restored.
וָהֵב is almost certainly a proper name, although of an unknown place. בָּסוּפָה is also considered by many as the name of a locality "in Suphah;" it occurs, however, in Nahum 1:3 in the sense given above, and indeed it is not at all a rare word in Job, Proverbs, and the Prophets; it seems best, therefore, to give it the same meaning here.