Az-Zukhruf 43:24

Qala awa law ji/tukum bi-ahdamimma wajadtum AAalayhi abaakum qalooinna bima orsiltum bihi kafiroon

[Each warner] said, "Even if I brought you better guidance than that [religion] upon which you found your fathers?" They said, "Indeed we, in that with which you were sent, are disbelievers."

He said, “Even if I bring to you something better in guidance than that on which you have found your fathers?” They said, “We totally disbelieve in what you are sent with.”