Joshua 1:4

4.From the wilderness and this Lebanon, etc How the truth and fulfillment of this promise surmounted all the obstacles interposed by the wickedness of the people, though they did not obtain immediate possession of the whole territory, I have explained in the Argument. For although God had unfolded the inestimable treasures of his beneficence by constituting them lords of the country, it did not follow that their misconduct was not to be chastised. Nay, there behooved to be a fulfillment of the threatening which Moses had denounced, viz., that if the nations doomed to destruction were not destroyed, they would prove thorns and stings in their eyes and sides. But as the promise was by no means broken or rendered void by the delay of forty years, during which they were led wandering through the desert, so the entire possession, though long suspended, proved the faithfulness of the decree by which it had been adjudged.

The people had it in their power to obtain possession of the prescribed boundaries in due time; they declined to do so. For this they deserved to have been expelled altogether. (18) But the divine indulgence granted them an extent of territory sufficient for their commodious habitation; and although it had been foretold that, in just punishment, the residue of the nations whom they spared would prove pernicious to them, still, they suffered no molestation, unless when they provoked the Divine anger by their perfidy and almost continual defection: for as often as their affairs became prosperous, they turned aside to wantonness. Still, owing to the wonderful goodness of God, when oppressed by the violence of the enemy, and, as it were, thrust down to the grave, they continued to live in death; and not only so, but every now and then deliverers arose, and, contrary to all hope, retrieved them from ruin. (19)

The Great Sea means the Mediterranean, and to it the land of the Hittites forms the opposite boundary; in the same way Lebanon is opposed to the Euphrates; but it must be observed that under Lebanon the desert is comprehended, as appears from another passage. (20)