John Calvin on Isaiah 22:10

10. And you numbered the houses of Jerusalem. He means that the city was closely examined on all sides, that there might not be a house or building which was not defended. Others think that the houses were numbered, that they might have a supply of watchmen. But the former interpretation is preferable, and is confirmed by what the Prophet afterwards adds, that the houses were thrown down for the purpose of rebuilding the walls of the city. This is commonly neglected in the time of peace, and the houses of private individuals are often built on the very walls, and, on that account, must be thrown down in the time of war, to supply the means of fighting and of repelling the enemy, and also lest, by means of houses so near the wall, secret communications with the enemy should be maintained.