What is the explanation of the hadith: "A nation from among the Children of Israel was lost, and it is not known what became of them," and how does this authentic hadith reconcile with the words of Allah Almighty: "Nor does he speak of (his own) desire. It is no less than inspiration sent down to him," given the presence of the Prophet's (peace be upon him) ijtihad (independent reasoning)? And is Sahih Muslim a book sent down from heaven?

Sahih Muslim is one of the greatest and most authentic compilations in Islam. The Ummah has accepted it, and scholars have agreed that it is the most authentic book after the Holy Quran, along with Sahih Al-Bukhari. Everything that Imam Muslim authenticated in his book is definitively authentic and provides theoretical knowledge, because the Ummah has accepted it. Some hadiths in it have been criticized, and scholars have responded to those criticisms.