The Prophet's sole mission was to deliver Quran, the whole Quran, and
nothing but Quran (3:20; 5:48-50, 92, 99; 6:19; 13:40; 16:35, 82; 24:54;
29:18; 42:48; 64:12).
Delivering the Quran was such a momentous and noble mission that the Prophet
did not have any time to do anything else. Moreover, the Prophet was enjoined
in the strongest words from issuing any religious teachings besides the Quran
(69:38-47). He was even enjoined from explaining the Quran (75:15-19) - God
is the only teacher of the Quran (55:1-2) and the Quran is the best Hadith
(39:23 & 45:6).
These Quranic facts are manifested in the historical reality that the
words and actions (Hadith & Sunna) attributed to the Prophet did not
appear until the second century after his death. The Quran has prophesied
the fabrication of Hadith and Sunna by the Prophet's enemies (6:112-115).
The Quran teaches us that it was God's will to permit the invention of Hadith
and Sunna to serve as criteria for exposing those who believe only with their
lips, not in their hearts. Those who are attracted to Hadith and Sunna are
proven to be false believers (6:113). Ironically, the books of Hadith report
the Prophet's orders to write down nothing from him except the Quran! Shown
below are two such Hadiths taken from the Hadithists' most reliable sources,
Sahih Muslim and Is-haah Ahmad Ibn Hanbal:
The Prophet said, "Do not write down anything from me except the Quran."
[Ahmed, Vol. 1, Page 171, and Sahih Muslim]
This Hadith states that the Prophet maintained his anti-Hadith stand until
death. [Ahmed, Vol. 1, Page 192]