Who is the sect that relies on the Quran but does not accept the Sunnah of the Prophet, sallallaahu alayhi wa sallam?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.

The sect that only relies on the evidence of the Quran is Al-Khawaarij in the former times, but in the present time, there is a group called the Qur’aniyoon (those who rely on the Quran) and who believe in the same belief; there are some of them in few countries. This belief infiltrated them through some orientalists and defeated intellectuals.

Denying the Sunnah is an act that takes the person out of the fold of Islam because the Sunnah explains and clarifies the Quran. Moreover, the Sunnah contains some legislations that were not mentioned in the Quran. Therefore, it is an obligation for whoever believes in the Quran to believe in the Sunnah as Allaah Says (what means): {And whatever the Messenger [Muhammad ] has given you — take it; and what he has forbidden you — refrain from it.}[Quran 59:7]. Allaah further Says (what means): {He who obeys the Messenger has obeyed Allaah.}[Quran 4:80]. In another verse Allaah Says (what means): {And We revealed to you the message [i.e. the Quran] that you may make clear to the people what was sent down to them and that they might give thought.}[Quran 16:44]. Indeed there are many verses in this context.

Allaah Knows best.