Commentary for Psalms 89:36
אַ֭חַת נִשְׁבַּ֣עְתִּי בְקָדְשִׁ֑י אִֽם־לְדָוִ֥ד אֲכַזֵּֽב׃
Once have I sworn by My holiness: Surely I will not be false unto David;
Rashi on Psalms
that I will not fail David Heb. אכזב, an expression of (Isa. 58:11): “whose water does not fail (יכזבו),” faliance in Old French, failure; possibly from the Latin fallera, deception.
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