Chapter 10, Verses 6 and 7 - Sun Tzu

When the position is such that neither side will gain by making the first move, it is called temporizing ground. In a position of this sort, even though the enemy should offer us an attractive bait, it will be advisable not to stir forth, but rather to retreat, thus enticing the enemy in his turn; then, when part of his army has come out, we may deliver our attack with advantage.
~ from The Art of War, Giles translation ~

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