שָׁ֣לַֽח חֹ֭שֶׁךְ וַיַּחְשִׁ֑ךְ וְלֹֽא־מָ֝ר֗וּ אֶת־דברוו [דְּבָרֽוֹ׃]
He sent darkness, and it was dark; And they rebelled not against His word.
Rashi on Psalms
And they did not disobey His word The plagues, that He commanded upon them, came according to His commandments and did not deviate from His word.