Tafsir of Al-An'am 6:21

ومن أظلم ممن افترى على الله كذبا أو كذب باياته

And who does more wrong than he who invents a lie against Allah or rejects His Ayat, meaning, there is no person more unjust than he who lies about Allah and claims that Allah has sent him, while Allah did not send him. There is no person more unjust than he who denies Allah's proofs, signs and evidences,

إنه ﻻ يفلح الظالمون

Verily, the wrongdoers shall never be successful. Surely, both of these people will never acquire success, whoever falsely (claims that Allah sent him) and whoever refuses (Allah's Ayat)