1 Samuel 30:10 (KJV)

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.

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.

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.

And they found an Egyptian in the field, and brought him to David, and gave him bread, and he did eat; and they made him drink water;

And they gave him a piece of a cake of figs, and two clusters of raisins: and when he had eaten, his spirit came again to him: for he had eaten no bread, nor drunk any water, three days and three nights.