Deuteronomy 32:15

Jeshurun Israel is called Jeshurun, both here and chap. Deuteronomy 33:5; Deuteronomy 33:26; as also Isaiah 44:2. Some consider the word as being derived from שׁור, shur, to see, and think the appellation was given them because they were so highly favoured with divine manifestations. But it is much more probable that it is derived from ישׁר, jashar, to be right, upright, or righteous, and that they are called Jeshurun, because they were a people professing righteousness, and were governed by righteous laws. Moses might also give them this name by way of instruction, to remind them what they ought to be, and by way of reproof, to show them what a shame it was that they should degenerate so far from their name and profession. Waxed fat and kicked As well-fed cattle were wont to do: he grew insolent and rebellious against God, and against his word and Spirit. Moses here, transported in his mind to future scenes, speaks in the prophetic style, which often represents future events as actually present, or already past, to denote the certainty of the things foretold. The meaning is, that Israel, in the days of their prosperity, would make a very bad use of the blessings bestowed on them, would spurn at the yoke of God's law, and become wanton and ungovernable, like pampered horses. And lightly esteemed the Rock of his salvation That is, his mighty Saviour and Deliverer; as if he had said, I see the time approaching when they shall notoriously abuse the goodness of God, and behave with the utmost ingratitude toward the Author of all their mercies. The Hebrew word ינבל jenabel, which we render, He lightly esteemed, signifies, He rejected with the greatest contempt. Thus the Jews, in after ages, rejected their Messiah, who was in the most eminent sense the Rock of their salvation, and thereby again most awfully fulfilled this prophecy, after they had fulfilled it several times before. But prosperity is but too apt to make men forget and forsake God, and lightly to esteem both him and his salvation.