`Some inconsistencies in usage here.  Please indicate if this is wrong:  *sira is the life of Muhammad, during which the revelation (Qur'an) was dictated, and during which he spoke the authentic hadith *sunnah consists of both hadith and sira (example) *hadith are validated by isnah, ``backing``, a science of its own *hadith are extremely significant as social rules and moral guidance  If this is all so, why aren't there separate links in this article to sira and sunnah, and why doesn't this article list some undisputed hadith?  The article on isnah already describes the process, and on early Muslim philosophy already describes the significance of this in the Islamic culture of scholarship.  So, this article should be only about the actual hadith, while a sunnah article can be about the use of the sira and hadith in practice today and in history...?  It wouldn't matter much except there are some redundancies here with isnah.`