Chapter 5, Verses 19 and 20 - Sun Tzu

Thus one who is skillful at keeping the enemy on the move maintains deceitful appearances, according to which the enemy will act. He sacrifices something, that the enemy may snatch at it. By holding out baits, he keeps him on the march; then with a body of picked men he lies in wait for him.
~ from The Art of War, Giles translation ~

Go here to read the introductory post to the verses of The Art of War.