Muslims believe in the Quran, that it's the very words of Allah, and that it's Him who protect it. Now my question is whether the Islamic hadith and, in particular, those compiled in Saih Bukhari, are also the very words of Allah. How Can we belive All the Hadith are in real form. Does Allah protect it from changing ? while Allah is says in Quran "inna Nahnu wa inna Elhe he Hafizon" Does Allah says about Hadith like Sai Bukhari ?
Quran is Kalam of Allah, whereas, Ahadeeth are the narrations made by people mainly from the holy prophet peace be upon him and his household. Therefore, Ahadeeth are not fully protected by Allah in the sense Quran is protected, however, there are Islamic studies on to determine which Ahadeeth are more reliable and which Ahadeeth are weaker than to be easily trusted.
Sahih Bukhari is considered as one of the most reliable hadeeth book at least for a large portion of Muslims, like Al-Kaafi is another most reliable hadeeth book for another groups of Muslims, however, all these books may have stronger or weaker Hadeeth, so that we can not easily assure if a Hadeeth is correct as we may wish.