question #1 Sahih al-Bukhari 5145, Book 67, Hadith 80 : What is the significance of keeping the Prophet’s secrets in Islamic tradition?

“When Hafsa became a widow,” `Umar said, “I met Abu Bakr and said to him, ‘If you wish I will
marry Hafsa bint `Umar to you.’ I waited for a few days then Allah’s Messenger (ﷺ) asked for her hand. Later
Abu Bakr met me and said, ‘Nothing stopped me from returning to you concerning your offer except
that I knew that Allah’s Messenger (ﷺ) had mentioned (his wish to marry) her, and I could never let out the
secret of Allah’s Messenger (ﷺ) . If he had left her, I would have accepted her.’ ”