I have heard it said that the words Shia and Sunni have not been mentioned in the Koran. Is that true? If so, why are Muslims divided on this issue?

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I have heard it said that the words Shia and Sunni have not been mentioned in the Koran. Is that true? If so, why are Muslims divided on this issue?
Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 3 years ago

Shia Islam means following the teachings of the Prophet Muhammad (SAWA) narrated by the most pious and most knowledgeable who are Ahlul Bayt (AS) who are the Progeny of the Prophet. Allah (SWT) mentioned in Quran the term Shia for the followers of the Prophets. (And from his (Noah's) Shia was Ebrahim) Sura Al-Saaffaat, verse 83. Quran mentioned (in Sura Al-Qasass, verse 15) a follower of the Prophet Moosa disputing with a person from Moosa's enemies and calls the follower of Moosa as from His Shia.

Wassalam.