Quran 42:14 — Consultation (Al-Shoora)

Ironically, they broke up into sects only after the knowledge had come to them, due to jealousy and resentment among themselves. If it were not for a predetermined decision from your Lord to respite them for a definite interim, they would have been judged immediately. Indeed, the later generations who inherited the scripture are full of doubts.

[42:13] He decreed for you the same religion decreed for Noah, and what we inspired to you, and what we decreed for Abraham, Moses, and Jesus: "You shall uphold this one religion, and do not divide it." The idol worshipers will greatly resent what you invite them to do. GOD redeems to Himself whomever He wills; He guides to Himself only those who totally submit.

[42:15] This is what you shall preach, and steadfastly maintain what you are commanded to do, and do not follow their wishes. And proclaim: "I believe in all the scriptures sent down by GOD. I was commanded to judge among you equitably. GOD is our Lord and your Lord. We have our deeds and you have your deeds. There is no argument between us and you. GOD will gather us all together; to Him is the ultimate destiny."