What is the response to one who does not cite the authentic hadith as evidence because this matter is not explicitly stated in the Qur'an?

The questioner : of His EminenceThe Shaykh : What is the response to one who does not cite the authentic hadith as evidence because this matter is not explicitly stated in the Qur'an, or who interprets the hadith in a way that suits his desires?

The Shaykh : What do you mean? I did not understand. Naturally, such a person is not a Muslim; for Allah (Mighty and Majestic) has commanded that when people differ and dispute over any of the rulings, they should refer to two things: the Book of Allah and the Sunnah of the Messenger of Allah (peace and blessings be upon him); as He (the Exalted) said: . The scholars of exegesis have agreed that the reference to Allah in this verse means reference to His Book. This is a matter of obvious clarity; for referring to Allah does not mean referring to a judge or a ruler to whom the disputing parties go. Our Lord (Mighty and Majestic) is not one to whom humans can refer in His own essence (Blessed and Exalted is He). Therefore, they have agreed that the intended meaning of "referring to Allah" involves a deleted implied addition, meaning: to His Book.
Likewise, regarding the reference to His Messenger; it is not possible to refer to his person, especially for those who were far from him during his lifetime, and more specifically for those who came after his death (peace be upon him); for they cannot refer to his person. Thus, the intended meaning of referring to the Messenger is referring to his Sunnah. So whoever claims that he is content with the Qur'an without the Sunnah; he has disbelieved in Allah and His Messenger by this verse and by many similar verses; as in His saying (the Exalted): , and His saying (Blessed and Exalted is He): . So whoever does not believe in his explanation (peace and blessings be upon him), which Allah entrusted to the Qur'an, has not believed in the Qur'an. The most famous verse in this regard is: .
So the one who claims that he does not judge by his Sunnah (peace be upon him), but only by the Qur'an; he is not a believer in the Qur'an, and what Allah (the Exalted) said about some of the People of the Book applies to him: . Therefore, the Prophet (peace and blessings be upon him) issued a severe warning against relying on the Qur'an only without the Sunnah; he said (peace and blessings be upon him): ; for as it came in the Qur'an: .
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 characteristics did not come in the Qur'an. So where did he get these characteristics of bowing, prostration, remembrances, and the tashahhud? All these details came to us only 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 persisted in not relying on the Qur'an in his religion, he would be killed for disbelief, not as a hadd punishment, and if he repents, Allah will accept his repentance.