Did Quran and Hadith come from the same source?

Sunnis love to claim that the Hadith and the Quran came from the same source; therefore, it doesn’t make sense to accept one and reject the other. There are numerous problems with this argument. Foremost, unlike the Hadith, the Quran has God’s divine guarantee that it will be preserved.

15:9 Absolutely, we have revealed the reminder, and, absolutely, we will preserve it.

(٩) إِنَّا نَحْنُ نَزَّلْنَا ٱلذِّكْرَ وَإِنَّا لَهُۥ لَحَـٰفِظُونَ

Secondly, the Quran is the most massively transmitted scripture in the history of the world. No other text has been memorized by so many people generation after generation throughout history. This is not the same for the Hadith. Not only was Hadith not written until the second century, but no Hadith would even be considered mutawtir except for the Quran.

The Companion Wathila b. Asqa‘ had admitted that sometimes the early Muslims even confused the exact wording of the Quran, which was universally well-known and well-preserved. So how, he asked, could one expect any less in the case of a report that the Prophet had said just once? Al-Hasan al-Basri is reported to have said, If we only narrated to you what we could repeat word for word, we would only narrate two hadiths. Hadith Muhammad s Legacy in the Medieval and Modern World p. 24