This refers to all of the people who were with David. Alternate translation: "bring back all of the people who were with him" (See: [[rc://en/ta/man/jit/figs-explicit]])
Here Ahithophel speaks of the peoples' happiness by comparing it to a bride's happiness. Alternate translation: "and they will come happily, like a bride is happy when she comes to her husband" or "and they will come happily" (See: [[rc://en/ta/man/jit/figs-simile]])