An early quran only group : al-Sakkakiyah
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al-Sakkakiyah
The followers of Abdullah (Abdallah) al-Sakkak, a jeweller from the Berber tribe of Lawwatah.he lived in Qantrarah, of South Tunisia. On seven points in his thought he differed from the rest of the Ibadhis.
i) He denied the rule of sunnah and personal judgement, and held that the legal system is to be derived from Quran only.
ii) Prayers in congregation are an innovation (bidah).
iii) Calling to prayer (adhan) is an innovation.
iv) Praying in clothes which contain lice is not permitted.
v) In prayers, Muslims should recite only the Quranic verses the interpretation of which they know.
vi) The grain threshed on a threshing floor is unclean (najas) because it is mixed with dung, and also vegetables from gardens in which dung is used are unclean.
This group was strongly opposed by the Ibadhi scholars and its followers were regarded as polytheists (mushrikun). It is reported that the Ibadhis bury the dead of non Ibadhi Muslims in the Islamic way, but this group would drag them to pits.However, the views of this group did not spread outside Qantrarah, and disappeared completely by the end of the fifth century H.
http//www.islamfact.com/books-htm/ibadi/69.htm