Shall not go up. — The enemy, on the same battle-expound, would have prepared for attack from the same direction as before; consequently David is directed to go round them and attack them unexpectedly from the opposite quarter.
Related Commentaries of 2 Samuel 5:23
2 Samuel 5:23
23 And when David enquired of the LORD, he said, Thou shalt not go up; but fetch a compass behind them, and come upon them over against the mulberry trees.