What is the ruling on one who argues using only the Qur'an and rejects the Sunnah?

The questioner:
May Allah reward you, Honorable Shaykh. This questioner says: In the author's words (may Allah have mercy on him), "If you hear a man who is brought an athar (report from a Companion or successor) and he does not want it, but wants the Qur'an, then there is no doubt that he is a man who has embraced Zindiqah (heresy)." Does this mean that he is a disbeliever? And does this statement apply?

The Shaykh:
Yes, it means that he is a disbeliever if he rejects the Sunnah. And what is this but disbelief? This is explicit disbelief. If he says, "We never argue with the Sunnah, but only with the Qur'an," this is disbelief. Yes.

The questioner:
May Allah reward you. And in the rest of his question, he asks: Does this statement apply to one who rejects ahad (single-narrator) hadiths in the chapter of creed?

The Shaykh:
This does not apply to him in that he is declared a disbeliever, but he is on the path to disbelief because he did not reject all the hadiths, but only says that ahad hadiths in creed are rejected. As for the legal rulings, the halal (lawful) and the haram (forbidden), he does not reject them. So he is not ruled to be a disbeliever; he is ruled to be misguided, and not ruled to be a disbeliever, until it is clarified to him and he persists in what he is upon. Yes.