| Clarke's Commentary on the Bible The Lord shall fight for you - Ye shall have no part in the honor of the day; God alone shall bring you off, and defeat your foes. Ye shall hold your peace - Your unbelieving fears and clamours shall be confounded, and ye shall see that by might none shall be able to prevail against the Lord, and that the feeblest shall take the prey when the power of Jehovah is exerted.
Gill's Exposition of the Entire BibleThe Lord shall fight for you,.... By commanding the wind of the heavens, and the waves of the sea, and employing them against their enemies, and on their behalf; they being unarmed, and so not in a condition to fight for themselves, as well as they had no heart or spirit for it: and ye shall hold your peace; be still, and quiet, and easy in your minds, and forbear saying or doing anything; "be silent"; and neither express the fear and distress of their minds, by any mournful sounds, nor their joy of faith by shouts and huzzas; as they could not draw a sword, they were not so much as to blow a trumpet, and break a pitcher, and cry the sword of the Lord, and of Israel as they after did on another occasion, at least their posterity.
Keil and Delitzsch Biblical Commentary on the Old Testament"Jehovah will fight for you (לכם, dat comm.), but you will be silent," i.e., keep quiet, and not complain any more (cf. Genesis 34:5).
Geneva Study BibleThe LORD shall fight for you, and ye shall {h} hold your peace. (h) Only put your trust in God without grudging or doubting.
Matthew Henry's Concise Commentary14:10-14 There was no way open to Israel but upward, and thence their deliverance came. We may be in the way of duty, following God, and hastening toward heaven, yet may be troubled on every side. Some cried out unto the Lord; their fear led them to pray, and that was well. God brings us into straits, that he may bring us to our knees. Others cried out against Moses; fear set them murmuring as if God were not still able to work miracles. They quarrel with Moses for bringing them out of Egypt; and so were angry with God for the greatest kindness ever done them; thus gross are the absurdities of unbelief. Moses says, Fear ye not. It is always our duty and interest, when we cannot get out of troubles, yet to get above our fears; let them quicken our prayers and endeavours, but not silence our faith and hope. Stand still, think not to save yourselves either by fighting or flying; wait God's orders, and observe them. Compose yourselves, by confidence in God, into peaceful thoughts of the great salvation God is about to work for you. If God brings his people into straits, he will find a way to bring them out. | 
