Deuteronomy 32:15

Israel’s Rebellion

15 But Jeshurun
To make the continuity of the referent clear, some English versions substitute “Jacob” here (NAB, NRSV) while others replace “Jeshurun” with “Israel” (NCV, CEV, NLT) or “the Lord’s people” (TEV).
Jeshurun is a term of affection derived from the Hebrew verb יָשַׁר (yashar, “be upright”). Here it speaks of Israel “in an ideal situation, with its ‘uprightness’ due more to God’s help than his own efforts” (M. Mulder, TDOT 6:475).
became fat and kicked,
you
The LXX reads the third person masculine singular (“he”) for the MT second person masculine singular (“you”), but such alterations are unnecessary in Hebrew poetic texts where subjects fluctuate frequently and without warning.
got fat, thick, and stuffed!
Then he deserted the God who made him,
and treated the Rock who saved him with contempt.
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