נִשְׁבַּ֛ע יְהוָ֥ה צְבָא֖וֹת לֵאמֹ֑ר אִם־לֹ֞א כַּאֲשֶׁ֤ר דִּמִּ֙יתִי֙ כֵּ֣ן הָיָ֔תָה וְכַאֲשֶׁ֥ר יָעַ֖צְתִּי הִ֥יא תָקֽוּם׃
L’Éternel-Cebaot a prononcé ce serment: "Certes, ce que j’ai résolu arrivera, ce que j’ai décrété s’accomplira.
Ramban
IM LO’ (IF NOT) AS YE HAVE SPOKEN IN MINE EARS. The meaning thereof is as an expression of wonder: “Will I not do to you as ye have spoken?” Such is the way of the [Sacred] Language: [Thou art sent] not to many people of an unintelligible speech and of a slow tongue, whose words thou canst not understand. ‘Im lo’ (would they not) have hearkened unto thee if I sent thee to them?157Ezekiel 3:5-6. Similarly, ‘im lo’ (if not) as I have thought did it come to pass?158Isaiah 14:24.