Al-An'am 6:93

Waman athlamu mimmani iftaraAAala Allahi kathiban aw qala oohiyailayya walam yooha ilayhi shay-on waman qalasaonzilu mithla ma anzala Allahu walaw taraithi aththalimoona fee ghamaratialmawti walmala-ikatu basitooaydeehim akhrijoo anfusakumu alyawma tujzawna AAathabaalhooni bima kuntum taqooloona AAala Allahighayra alhaqqi wakuntum AAan ayatihitastakbiroon

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, [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."

Who is more unjust than the one who fabricates a lie against Allah or says, “Revelation has been sent to me”, whereas no revelation has been sent to him, and the one who says, “I would produce the like of what Allah has revealed.” If only you could witness when the unjust are in the throes of death, and the angels stretch their hands (and say), “Out with your souls. Today, you shall have your punishment, a punishment of humiliation, because you have been saying about Allah what is not true, and have been showing arrogance against His verses.”