1 Samuel 30:8-10

King James Version

⁸ And David enquired at the Lord, saying, Shall I pursue after this troop? shall I overtake them? And he answered him, Pursue: for thou shalt surely overtake them, and without fail recover all.

⁹ So David went, he and the six hundred men that were with him, and came to the brook Besor, where those that were left behind stayed.

¹⁰ 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.