Numerous verses say follow only the Quran, this means follow only Quran, not 'sanctioned' practices, sunnah, hadith or ancestral practices which the Quran does say to reject.
2:119 We have sent you (O Prophet) with the Decisive Truth as a bearer of glad tidings and as a warner. But you will not be questioned about the companions of the blazing fire. [13:40. Jaheem = Blazing fire = Insurmountable Barrier to the development of the human ‘self’ = Figuratively, Hell. The human ‘self’ can make progress only by accepting Divine Laws and doing good to God’s creations. See the author's note at the end of this rendition for an understanding of Self-actualization, Afterlife, Paradise and Hellfire]
2:120 Yet, never will the Jews [or N2I muslims] be pleased with you, nor will the Christians, unless you follow their form of religion. Say, “God’s Guidance - it is the only Guidance.” And if you follow their wishes and errant views after the KNOWLEDGE THAT HAS COME TO YOU, then you will find no ally or helper against God. [7:3, 10:109, 13:37. It is not a matter of my religion or your religion. Al-Qur’an is the updated, unadulterated Message from the same Creator Who revealed the previous Scriptures]
2:121 Those to whom We have given the Book study and follow it as it should be studied and followed. They are the ones who truly believe in it. And whoever rejects it, such are the losers. [10:58]
"Knowledge has come to you" means the Quran to judge what you should do, not what you want to do!