'Brook' in the Bible

He took his stick in his hand and chose for himself five smooth stones from the brook, and put them in the shepherd’s bag which he had, even in his pouch, and his sling was in his hand; and he approached the Philistine.

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

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

When David came to the two hundred men who were too exhausted to follow David, who had also been left at the brook Besor, and they went out to meet David and to meet the people who were with him, then David approached the people and greeted them.