An-Nisa 4:65

Fala warabbika la yu/minoona hattayuhakkimooka feema shajara baynahum thumma layajidoo fee anfusihim harajan mimma qadaytawayusallimoo tasleema

But no, by your Lord, they will not [truly] believe until they make you, [O Muḥammad], judge concerning that over which they dispute among themselves and then find within themselves no discomfort from what you have judged and submit in [full, willing] submission.

So, never by your Lord! Never shall they become believers, unless they make you the judge in the disputes that arise between them, then find no discomfort in their hearts against what you have decided, and surrender to it in total submission.