question #1 Sahih al-Bukhari 3112, Book 57, Hadith 21 : What is the significance of delivering messages or orders from the Prophet (ﷺ) to others?

I heard Mundhir at-Tuzi reporting Ibn Hanafiya who said,”My father
sent me saying, ‘Take this letter to `Uthman for it contains the orders of the Prophet (ﷺ) concerning the
Sadaqa.’ ”