The Holy Quran 26:213 — Surah Ash-Shu'ara
Arabic text
فَلَا تَدْعُ مَعَ ٱللَّهِ إِلَـٰهًا ءَاخَرَ فَتَكُونَ مِنَ ٱلْمُعَذَّبِينَ
Translation
Do not call to another Ilaah besides Allaah, for then you will be of the punished ones.
Tafsir (excerpt) — Tafsir Usmani
this is addressed to the Messenger ﷺ, but meant to be heard by others. That is, since this Book has, beyond all doubt, been sent down by Allah and the devil has not the slightest share in it, then follow its teaching, the very foundation of which is tawhid (the Oneness of Allah). Do not take the devilish path of shirk (associating partners with Allah)
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