The Sunnah is the companion of the Qur'an, so whoever abandons using it as evidence is killed for disbelief.
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The Shaykh : And for this reason, the severe warning came from the Prophet (peace and blessings be upon him) against relying on the Qur'an alone without the Sunnah. He said (may Allah bless him and grant him peace): Because, as it came in the Qur'an: [An-Najm 53:3-4].
And in conclusion, he (peace and blessings be upon him) gathered the two primary sources for Muslims, the Book and the Sunnah, in his saying (peace and blessings be upon him):.
So, if a Muslim explicitly states, even if he prays and fasts, that he does not rely in his religion except on the Noble Qur'an, he is a disbeliever. The first thing that indicates his disbelief and contradiction is that he prays a prayer; if he is sincere in this prayer, its description is not found in the Qur'an. So where did this description come to him? The bowing, prostration, remembrances, and tashahhud—these details all came to us through the Messenger of Allah (peace and blessings be upon him). So, whoever claims that he does not rely except on the Qur'an, his Islam is not valid. Rather, if there were a ruler who enforces the Shari'ah with all its rulings, this person would be called to repent. If he persists in saying that he does not rely in his religion except on the Qur'an, he is killed for disbelief, and it is not a hadd punishment. And if he repents, Allah accepts his repentance. Yes.
I will not find one of you reclining on his couch saying, "This is the Book of Allah, so whatever we find therein as forbidden, we forbid, and whatever we find therein as lawful, we make lawful." Do you not know that I was given the Qur'an and something similar to it with it? Indeed, what the Messenger of Allah has forbidden is like what Allah has forbidden.
لا ألفين أحدكم متّكئًا على أريكته يقول هذا كتاب الله فما وجدنا فيه حراماً حرّمناه وما وجدنا فيه حلالاً حلّلناه ، ألا إني أوتيت القرآن ومثله معه ألا إن ما حرّم رسول الله مثل ما حرّم الله(3) Nor does he speak from [his own] inclination. (4) It is not but a revelation revealed,
وما ينطق عن الهوى * إن هو إلا وحي يوحىAnd in conclusion, he (peace and blessings be upon him) gathered the two primary sources for Muslims, the Book and the Sunnah, in his saying (peace and blessings be upon him):
I have left for you two matters by which you will not go astray as long as you hold fast to them: the Book of Allah and my Sunnah. They will not separate until they return to me at the Pool.
تركت فيكم أمرين لن تضلوا ما إن تمسّكتم بهما : كتاب الله وسنّتي ، ولن يتفرّقا حتى يردا عليّ الحوضSo, if a Muslim explicitly states, even if he prays and fasts, that he does not rely in his religion except on the Noble Qur'an, he is a disbeliever. The first thing that indicates his disbelief and contradiction is that he prays a prayer; if he is sincere in this prayer, its description is not found in the Qur'an. So where did this description come to him? The bowing, prostration, remembrances, and tashahhud—these details all came to us through the Messenger of Allah (peace and blessings be upon him). So, whoever claims that he does not rely except on the Qur'an, his Islam is not valid. Rather, if there were a ruler who enforces the Shari'ah with all its rulings, this person would be called to repent. If he persists in saying that he does not rely in his religion except on the Qur'an, he is killed for disbelief, and it is not a hadd punishment. And if he repents, Allah accepts his repentance. Yes.