ٱتَّبِعْ مَآ أُوحِىَ إِلَيْكَ مِن رَّبِّكَ ۖ لَآ إِلَـٰهَ إِلَّا هُوَ ۖ وَأَعْرِضْ عَنِ ٱلْمُشْرِكِينَ

Follow, [O Muḥammad], what has been revealed to you from your Lord - there is no deity except Him - and turn away from those who associate others with Allāh.

Al-An'am 106

وَمَنْ أَظْلَمُ مِمَّنِ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًا أَوْ قَالَ أُوحِىَ إِلَىَّ وَلَمْ يُوحَ إِلَيْهِ شَىْءٌ وَمَن قَالَ سَأُنزِلُ مِثْلَ مَآ أَنزَلَ ٱللَّهُ ۗ وَلَوْ تَرَىٰٓ إِذِ ٱلظَّـٰلِمُونَ فِى غَمَرَٰتِ ٱلْمَوْتِ وَٱلْمَلَـٰٓئِكَةُ بَاسِطُوٓا۟ أَيْدِيهِمْ أَخْرِجُوٓا۟ أَنفُسَكُمُ ۖ ٱلْيَوْمَ تُجْزَوْنَ عَذَابَ ٱلْهُونِ بِمَا كُنتُمْ تَقُولُونَ عَلَى ٱللَّهِ غَيْرَ ٱلْحَقِّ وَكُنتُمْ عَنْ ءَايَـٰتِهِۦ تَسْتَكْبِرُونَ

And who is more unjust than one who invents a lie about Allāh or says, "It has been inspired to me," while nothing has been inspired to him, and one who says, "I will reveal [something] like what Allāh revealed." And if you could but see when the wrongdoers are in the overwhelming pangs of death while the angels extend their hands,1 [saying], "Discharge your souls! Today you will be awarded the punishment of [extreme] humiliation for what you used to say against Allāh other than the truth and [that] you were, toward His verses, being arrogant."

Al-An'am 93

قُلْ أَىُّ شَىْءٍ أَكْبَرُ شَهَـٰدَةً ۖ قُلِ ٱللَّهُ ۖ شَهِيدٌۢ بَيْنِى وَبَيْنَكُمْ ۚ وَأُوحِىَ إِلَىَّ هَـٰذَا ٱلْقُرْءَانُ لِأُنذِرَكُم بِهِۦ وَمَنۢ بَلَغَ ۚ أَئِنَّكُمْ لَتَشْهَدُونَ أَنَّ مَعَ ٱللَّهِ ءَالِهَةً أُخْرَىٰ ۚ قُل لَّآ أَشْهَدُ ۚ قُلْ إِنَّمَا هُوَ إِلَـٰهٌ وَٰحِدٌ وَإِنَّنِى بَرِىٓءٌ مِّمَّا تُشْرِكُونَ

Say, "What thing is greatest in testimony?" Say, "Allāh is witness between me and you. And this Qur’ān was revealed to me that I may warn you thereby and whomever it reaches.1 Do you [truly] testify that with Allāh there are other deities?" Say, "I will not testify [with you]." Say, "Indeed, He is but one God, and indeed, I am free of what you associate [with Him]."

Al-An'am 19

ثُمَّ أَوْحَيْنَآ إِلَيْكَ أَنِ ٱتَّبِعْ مِلَّةَ إِبْرَٰهِيمَ حَنِيفًا ۖ وَمَا كَانَ مِنَ ٱلْمُشْرِكِينَ

Then We revealed to you, [O Muḥammad], to follow the religion of Abraham, inclining toward truth; and he was not of those who associate with Allāh.

An-Nahl 123

ذَٰلِكَ مِمَّآ أَوْحَىٰٓ إِلَيْكَ رَبُّكَ مِنَ ٱلْحِكْمَةِ ۗ وَلَا تَجْعَلْ مَعَ ٱللَّهِ إِلَـٰهًا ءَاخَرَ فَتُلْقَىٰ فِى جَهَنَّمَ مَلُومًا مَّدْحُورًا

That is from what your Lord has revealed to you, [O Muḥammad], of wisdom. And, [O mankind], do not make [as equal] with Allāh another deity, lest you be thrown into Hell, blamed and banished.

Al-Isra 39