Rashi on Deuteronomy 32:5/רש"י על דברים ל״ב:ה׳

1שחת לו — Take it as the Targum has it: חבילו להון לא לה “Corruption is theirs, not His”.

2בניו מומם HIS CHILDREN, THEIR FAULT — i.e., they were His children, and the corruption which they wrought is their fault.

3בניו מומם means: it was the fault of His children not His fault.

4דור עקש means, [A] CROOKED AND PERVERTED [GENERATION]. עקש has the same meaning as the verb in (Micah 3:9) “and pervert (יעקשו) all equity”. In Mishnaic Hebrew we have (Chullin 56a): a weasel whose teeth are bent and crooked (עקושות).

5ופתלתל entortille in old French, Engl, twisted: like a thread (פתיל), which one twines and twists round the central strand. The word פתלתל is of the “doubled” words (in which the two last letters are the same), like (Leviticus 13:49): ירקרק. אדמדם; (Psalms 38:31): סחרחר; (‎1 Kings 7:23; Targum Jonathan on): סגלגל‎.