This is a generalization. It means most of the men. It can be stated in active form. Alternate translation: "many of the men who were there heard others saying" (See: [[rc://en/ta/man/translate/figs-hyperbole]] and [[rc://en/ta/man/translate/figs-activepassive]])
Here "the people" refer to the people who followed David. Here "all" is an generalization. It means a large number came and gathered around him. Alternate translation: "many of the people" (See: [[rc://en/ta/man/translate/figs-hyperbole]])
Here "Israel" refers to the Israelite soldiers who followed Absalom. Alternate translation: "And every Israelite soldier fled to his own home" or "And all of the Israelite soldiers fled to their homes" (See: [[rc://en/ta/man/translate/figs-synecdoche]])