Adam Clarke on Ezekiel 21:22

At his right hand was the divination for Jerusalem - He had probably written on two arrows; one, Jerusalem; the other, Riblath; the third, left blank. He drew, and that on which Jerusalem was written came to his hand; in consequence of which he marched immediately against that city. It was ripe for destruction; and had he marched before or after, it would have fallen; but he never considered himself as sure of the conquest till now.