question #1 Sahih al-Bukhari 202, Book 4, Hadith 68 : What is the significance of accepting the testimony of reliable narrators in Islamic tradition?

Sa`d bin Abi Waqqas said, “The Prophet (ﷺ) passed wet hands over his Khuffs (socks made from thick
fabric or leather).” `Abdullah bin `Umar asked `Umar about it. `Umar replied in the affirmative and
added, “Whenever Sa`d narrates a Hadith from the Prophet, there is no need to ask anyone else about
it.”