20:1-9 In the wars wherein Israel engaged according to the will of God, they might expect the Divine assistance. The Lord was to be their only confidence. In these respects they were types of the Christian's warfare. Those unwilling to fight, must be sent away. The unwillingness might arise from a man's outward condition. God would not be served by men forced against their will. Thy people shall be willing, Ps 110:3. In running the Christian race, and fighting the good fight of faith, we must lay aside all that would make us unwilling. If a man's unwillingness rose from weakness and fear, he had leave to return from the war. The reason here given is, lest his brethren's heart fail as well as his heart. We must take heed that we fear not with the fear of them that are afraid, Isa 8:12.

2-4. when ye are come nigh unto the battle, that the priest shall approach and speak unto the people—Jewish writers say that there was a war priest appointed by a special ceremonial to attend the army. It was natural that the solemn objects and motives of religion should have been applied to animate patriotism, and so give additional impulse to valor; other people have done this. But in the case of Israel, the regular attendance of a priest on the battlefield was in accordance with their theocratic government, in which everything was done directly by God through His delegated ministers. It was the province of this priest to sound the trumpets (Nu 10:9; 31:6), and he had others under him who repeated at the head of each battalion the exhortations which he addressed to the warriors in general. The speech (De 20:3, 4) is marked by a brevity and expressiveness admirably suited to the occasion, namely, when the men were drawn up in line.