Final answer:
David fastening his sword is a symbolic gesture of taking up the mantle of a warrior, biblically associated with his courageous acts and numerous battles. It has been depicted by artists like Donatello and Bernini, showcasing different aspects of David's youth, readiness for battle, and dynamic action.
Step-by-step explanation:
When David fastened his sword, it symbolized his readiness to engage in battle and his transition from a shepherd boy to a warrior, which is depicted in various artistic representations. In terms of the biblical narrative, David's actions have been interpreted as decisive moments of action, whether it be against the Amalekites as in 1 Samuel 30:17, against Goliath with the giant's own sword, or in his numerous military campaigns as noted in second Samuel.
The narrative and imagery of David fastening his sword have also been captured in sculpture, such as those created by Donatello and Bernini. Donatello's David displays youthful innocence mixed with the gravity of his victory over Goliath, with the feather from Goliath's helm suggestively depicted, while Bernini's rendition portrays a tense and dynamic figure of David in motion, preparing for his encounter with the giant.