David’s inner circle of mighty warriors was not a uniform group; rather, it was made up of men from highly diverse and unique backgrounds. One of these elite fighters, Joel, is identified specifically through his relationship to his brother, Nathan. This family reference likely points to Nathan the Prophet. Because Nathan held such an important and respected position, Joel is explicitly linked to him to highlight this notable connection.
Another warrior in this elite group, Mibhar the son of Hagri, provides further insight into the makeup of David's military ranks. His presence shows that these top fighters were not restricted only to native-born Israelites. Instead, the group welcomed converts and individuals who originally came from foreign nations [ביאור שטיינזלץ].