question #1 Sahih al-Bukhari 2835, Book 56, Hadith 51 : What significance does the pledge of allegiance hold in the context of Jihad during the time of the Prophet Muhammad (ﷺ)?

The Emigrants and the Ansar started digging the trench around Medina carrying the earth on their
backs and saying, “We are those who have given a pledge of allegiance to Muhammad that we will I
carry on Jihad as long as we live.” The Prophet (ﷺ) kept on replying, “O Allah, there is no good except the
good of the Hereafter; so confer Your Blessings on the Ansar and the Emigrants.”