On another occasion David expressed his doubt of God's wisdom in having formed such apparently useless creatures as spiders are. They do nothing but spin a web that has no value. He was to have striking proof that even a spider's web may serve an important purpose. On one occasion he had taken refuge in a cave, and Saul and his attendants, in pursuit of him, were about to enter and seek him there. But God sent a spider to weave its web across the opening, and Saul told his men to desist from fruitless search in the cave, for the spider's web was undeniable proof that no one had passed through its entrance.