And Allah, the Exalted, says:

“If he had dared to fabricate any statements about Us, We would have seized him by the right hand, then severed his aorta, and none of you could have shielded him from Us.” ⦗Al-Ḥāqqah 44-47⦘.

And He, Exalted be He, says:

“Or do they say, ‘He has invented a lie against Allah’? If Allah so willed, He could seal your heart. Allah effaces falsehood and establishes the truth by His words.” ⦗Al-Shūrā 24⦘.

And He, Exalted be He, says:

“When We replace one verse with another—and Allah knows best what He sends down—they say, ‘You are only a fabricator.’ Most of them do not know. Say, ‘The Holy Spirit has brought it down from your Lord in truth, to strengthen those who believe, and as guidance and glad tidings for the Muslims.’” ⦗Al-Naḥl 101-102⦘.

And He, Exalted be He, says:

“When Our clear revelations are recited to them, those who do not look forward to meeting Us say, ‘Bring a Quran other than this, or change it.’ Say, ‘It is not for me to change it of my own accord; I only follow what is revealed to me.’” ⦗Yūnus 15⦘.

A thorough treatment of this belongs elsewhere; the point here is only that their attempt to build an argument on a single word of what he brought