1 Samuel 22:2

22:2 All those who were in trouble or owed someone money or were discontented gathered around him, and he became their leader. He had about four hundred men with him.

1 Samuel 25:13

25:13 Then David instructed his men, “Each of you strap on your sword!” So each one strapped on his sword, and David also strapped on his sword. About four hundred men followed David up, while two hundred stayed behind with the equipment.

1 Samuel 30:9-10

30:9 So David went, accompanied by his six hundred men. When he came to the Wadi Besor, those who were in the rear stayed there. 30:10 David and four hundred men continued the pursuit, but two hundred men who were too exhausted to cross the Wadi Besor stayed there.