Salam alaikum.

Allah Taala said in the Quran:

And if you are in doubt as to that which We have revealed to Our servant, then produce a chapter like it and call on your witnesses besides Allah if you are truthful.

Shaykh allama of shias, Al-Istarabadi narrated in his book “Taweel ayatu zaheer” (1/42-43) his own version of this verse:

Translation:

From Abu Jafar (alaihi salam): Jibril descended upon Muhammad (sallalahu alaihi wa ali) with this verse, in this form: “And if you are in doubt as to that which We have revealed to Our servant ABOUT ALI, then produce a chapter like it”