1 Samuel 30:8-10

Then David asked the LORD, “Should I chase after this band of raiders? Will I catch them?” And the LORD told him, “Yes, go after them. You will surely recover everything that was taken from you!” So David and his 600 men set out, and they came to the brook Besor. But 200 of the men were too exhausted to cross the brook, so David continued the pursuit with 400 men.