Quote a Qur'anic verse that Islam is incomplete without hadith.
Quote a Qur'anic verse stating that the hadith and sunnah of the Messenger are to be followed.
I will quote a verse about following the man and not the Messenger:
3:79 Never would a human being whom God has blessed with the Scripture, wisdom and even Prophetic office, thereafter say to people, “Be servants of me instead of God.” Rather, he would say, “Become true devotees of the Lord according to the Scripture you teach and explain.”
Example of Bukharian idol worshipper stupidity:
4:113 But for the grace of God upon you (O Prophet), a party among them were bent upon diverting you, but they only misled themselves. They cannot hurt you at all. He has given you the Book and wisdom. He teaches you what you did not know. (Contrary to blind faith, the use of Reason empowers you with Conviction.) God’s grace upon you is Infinite. [12:108]
In the above the Bukharians say the Book is the Qur'an and the wisdom is the hadith. If you accept this understanding then you are admitting that the Qur'an has no wisdom!
2:151 Just as We have sent a Messenger from among yourselves, conveying Our revelations to you in order to help you grow in goodness, and empower you with the knowledge of the Book and its wisdom. Thus, he teaches you what you knew not.
The teaching of Islam is only with the Revelation of Allah, and it has wisdom within it, not Bukharian fairy tales. But.....
2:269 He bestows wisdom to whoever wills to attain wisdom (according to His laws). And whoever is granted wisdom has truly been granted a great wealth. And only those who use their intellect remain mindful of what they learn.
[Making good use of their faculties helps people attain wisdom. 12:22, 17:36, 28:14]