فَلاَ وَرَبِّكَ لاَ يُؤْمِنُونَ حَتَّىَ يُحَكِّمُوكَ فِيمَا شَجَرَ بَيْنَهُمْ ثُمَّ لاَ يَجِدُواْ فِي أَنفُسِهِمْ حَرَجًا مِّمَّا قَضَيْتَ وَيُسَلِّمُواْ تَسْلِيمًا
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سورة النساء
(4/65) But no, by your Lord, they do not believe until they make you a judge of that which has become a matter of disagreement between them and then they do not find any discomfort in their hearts as to what you have decided, and submit in full submission.
Surah An-Nisa