2 Samuel 23 was likely recorded at the end of David's reign and it records 37 mighty men and guards
2 Samuel 23:1 (NKJV):
"Now these are the last words of David..."
2 Samuel 23:39 (NKJV):
...thirty-seven in all
Yet, in 1 Chronicles 11, 16 extra names are included (1 Chronicles 11:41-47). What could be a possible reason for this?