Do not set up another god with God. I give you a clear warning from Him.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (and set not any other god along with allah) refrain from saying: allah has a son or partner; (lo! i am a plain warner) in a language you understand (unto you from him) from allah.
Jalāl al-Dīn al-Maḥallī
تفسير : and do not set up another god alongside god. truly i am a clear warner to you from him (before fa-firrū, ‘so flee’, one may read an implicit [preceding] qul lahum, ‘say to them’).