Al-Ma'idah 5:48 وانزلنا اليك الكتاب بالحق مصدقا لما بين يديه من الكتاب ومهيمنا عليه فاحكم بينهم بما انزل الله ولا تتبع اهواءهم عما جاءك من الحق لكل جعلنا منكم شرعة ومنهاجا ولو شاء الله لجعلكم امة واحدة ولاكن ليبلوكم في ما اتاكم فاستبقوا الخيرات الى الله مرجعكم جميعا فينبيكم بما كنتم فيه تختلفون ٤٨

We sent to you [Muhammad] the Scripture with the truth, confirming the Scriptures that came before it, and with final authority over them: so judge between them according to what God has sent down. Do not follow their whims, which deviate from the truth that has come to you. We have assigned a law and a path to each of you. If God had so willed, He would have made you one community, but He wanted to test you through that which He has given you, so race to do good: you will all return to God and He will make clear to you the matters you differed about.