Sects are mentioned in the Quran in these verses:

[6:159] Those who divide themselves into sects do not belong with you. Their judgment rests with God, then He will inform them of everything they had done.

[30:32] (Do not fall in idol worship,) like those who divide their religion into sects; each party rejoicing with what they have.

[42:14] 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.

To learn more, read the Quran in English.

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