Shirk is the Worst form of Wrong, its Practitioner shall never succeed. Allah threatens those who associate anything else withHim and worship anything with Him. He informs that those whoassociate others with Allah:

لاَ بُرْهَانَ لَهُ

(of whom he has no proof), meaning no evidence for what he says. Then Allah says:

Commentary

The last few verses of this Surah Al-Mu'minun from verse 115 to verse 118 have special merit. Baghawi and Thalabi have related from Sayyidna Ibn Masud ؓ that he came across a person who was very ill. He recited the above verses into the sick man's ears and he was cured immediately. The Holy Prophet ﷺ asked him what he had whispered in the sick man's ears to which Sayyidna 'Abdullah Ibn Masud ؓ replied that he had recited these verses (115 to 118) in his ears. Thereupon the Holy Prophet ﷺ said, "I swear by Him Who has power over my life that if a person with genuine faith were to recite these verses on a mountain, the mountain itself may move from its place". (Qurtubi and Mazhari)