What is the best response to those 'Qur'an-only' Muslims who reject hadith?

The best response to those who reject hadith, or the sayings and actions of the Prophet Muhammad (peace be upon him) as a source of Islamic guidance, may depend on the specific context and the nature of their objections to hadith. Here are a few possible approaches that could be taken: Emphasize the importance of hadith in Islamic tradition: Hadith have played a central role in the development of Islamic thought and practice and are considered an essential source of Islamic guidance by the majority of Muslims. It may be helpful to explain the importance of hadith in understanding the teachings and example of the Prophet Muhammad (peace be upon him) and in providing context and clarification for the Quranic verses. Highlight the evidence for the authenticity of hadith: There are numerous methods and criteria that have been developed over the centuries to determine the authenticity of hadith. It may be helpful to present some of this evidence to show that hadith are reliable sources of Islamic guidance. Encourage a respectful and open-minded approach: It is important to respect the beliefs and opinions of others, even when we disagree with them. It may be helpful to encourage a respectful and open-minded approach to discussing hadith and other Islamic sources, and to encourage further study and exploration of the various perspectives on this issue. Evidences "And when there came to them a Book from Allah, confirming what was with them, although before they used to pray for victory against those who disbelieved, but when there came to them that which they recognized, they disbelieved in it; so the curse of Allah will be upon the disbelievers." (Qur'an 4:83) "And what the Messenger gives you, take; and what he forbids you, abstain (from)." (Qur'an 59:7) "There has certainly been for you in the Messenger of Allah an excellent pattern for anyone whose hope is in Allah and the Last Day and [who] remembers Allah often." (Qur'an 33:21) "Those who follow the Messenger, the unlettered prophet, whom they find written in what they have of the Torah and the Gospel, who enjoins upon them what is right and forbids them what is wrong and makes lawful for them the good things and prohibits for them the evil and relieves them of their burden and the shackles which were upon them. So they who have believed in him, honored him, supported him and followed the light which was sent down with him - it is those who will be the successful." (Qur'an 7:157) The Prophet (saw) said, "My example and the example of the prophets before me is like a man who builds a house and makes it perfect except for a place of one brick. People enter the house and admire its beauty, but say: 'Why has this place not been completed?' I am the brick, and I am the last of the prophets." The Prophet (saw) said, "Whosoever obeys me, obeys Allah; and whosoever disobeys me, disobeys Allah." The Prophet (saw) said, "I have left behind me two things, if you hold fast to them, you will never go astray: the Book of Allah and the Sunnah of His Prophet." The Prophet (saw) said, "The best of guidance is the guidance of Muhammad." The Prophet (saw) said, "Verily, I am leaving behind two things, the Qur'an and my Sunnah, and if you hold fast to them, you will never go astray."