'Four' in the Bible

The Philistines put themselves in array against Israel: and when they joined battle, Israel was struck before the Philistines; and they killed of the army in the field about four thousand men.

Everyone who was in distress, and everyone who was in debt, and everyone who was discontented, gathered themselves to him; and he became captain over them: and there were with him about four hundred men.

David said to his men, "Every man put on his sword!" Every man put on his sword. David also put on his sword. About four hundred men followed David; and two hundred stayed by the baggage.

The number of the days that David lived in the country of the Philistines was a full year and four months.

But David pursued, he and four hundred men; for two hundred stayed behind, who were so faint that they couldn't go over the brook Besor.

David struck them from the twilight even to the evening of the next day. Not a man of them escaped from there, except four hundred young men, who rode on camels and fled.