(11) They shall not know.--As to the adversaries, their plan was evidently to watch and surprise, instead of making the threatened attack.

4:7-15 The hindering good work is what bad men aim at, and promise themselves success in; but good work is God's work, and it shall prosper. God has many ways of bringing to light, and so of bringing to nought, the devices and designs of his church's enemies. If our enemies cannot frighten us from duty, or deceive us into sin, they cannot hurt us. Nehemiah put himself and his cause under the Divine protection. It was the way of this good man, and should be our way. All his cares, all his griefs, all his fears, he spread before God. Before he used any means, he made his prayer to God. Having prayed, he set a watch against the enemy. If we think to secure ourselves by prayer, without watchfulness, we are slothful, and tempt God; if by watchfulness, without prayer, we are proud, and slight God: either way, we forfeit his protection. God's care of our safety, should engage and encourage us to go on with vigour in our duty. As soon as a danger is over, let us return to our work, and trust God another time.And our adversaries said, they shall not know,.... Our designs upon them:

neither see; or perceive what we are about to do:

till we come in the midst of them; with an army suddenly, at an unawares, and unexpected:

and slay them; they being unarmed, and not prepared to defend themselves:

and cause the work to cease; as it must in course, the builders being slain.