1 Samuel 30:10

But David pursued, he and four hundred men. Two hundred stayed behind, who were too exhausted to cross the brook Besor.

Two hundred of them were too exhausted to cross the valley, but David and the other four hundred continued the pursuit.

David and four hundred of the men continued the pursuit, while two hundred stopped because they were too exhausted to cross the Wadi Besor.

But 200 of the men were too exhausted to cross the brook, so David continued the pursuit with 400 men.

But David pursued, he and four hundred men: for two hundred abode behind, which were so faint that they could not go over the brook Besor.