אַֽל־תִּפְחֲדוּ֙ וְאַל־תִּרְה֔וּ הֲלֹ֥א מֵאָ֛ז הִשְׁמַעְתִּ֥יךָ וְהִגַּ֖דְתִּי וְאַתֶּ֣ם עֵדָ֑י הֲיֵ֤שׁ אֱל֙וֹהַּ֙ מִבַּלְעָדַ֔י וְאֵ֥ין צ֖וּר בַּל־יָדָֽעְתִּי׃
Fear ye not, neither be afraid; Have I not announced unto thee of old, and declared it? And ye are My witnesses. Is there a God beside Me? Yea, there is no Rock; I know not any.
Read halakhic rulings (Jewish law) on Isaiah 44:8 from the Mishneh Torah and classical halakhic sources, free online.