This means that only if David went would his soldiers remain with him. AT: "only if you go will any of your men remain with you" (See: [[rc://en/ta/man/translate/figs-doublenegatives]])
# not one man will remain with you
This refers to them remaining loyal to him. AT: "not one man will remain loyal to you" (See: [[rc://en/ta/man/translate/figs-idiom]])