Deuteronomy 20

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.

Chapter 20 This chapter settles the militia, and establishes the laws and ordinances of war, I. Relating to the soldiers. 1. Those must be encouraged that were drawn up to battle (v. 1-4). 2. Those must be dismissed and sent back again whose private affairs called for their attendance at home (v. 5-7), or whose weakness and timidity unfitted them for service in the field (v. 8, 9). II. Relating to the enemies they made war with. 1. The treaties they must make with the cities that were far off (v. 10–15). 2. The destruction they must make of the people into whose land they were going (v. 16–18). 3. The care they must take, in besieging cities, not to destroy the fruit-trees (v. 19, 20).Verses 1-9 Israel was at this time to be considered rather as a camp than as a kingdom, entering upon an enemy’s country, and not yet settled in a country of their own; and, besides the war they were now entering upon in order to their settlement, even after their settlement they could neither protect nor enlarge their coast without hearing the alarms of war. It was therefore needful that they should have directions given them in their military affairs; and in these verses they are directed in managing, marshalling, and drawing up their own forces. And it is observable that the discipline of war here prescribed is so far from having any thing in it harsh or severe, as is usual in martial law, that the intent of the whole is, on the contrary, to encourage the soldiers, and to make their service easy to them.I. Those that were disposed to fight must be encouraged and animated against their fears.1. Moses here gives a general encouragement, which the leaders and commanders in the war must take to themselves: "Be not afraid of them, v. 1. Though the enemy have ever so much the advantage by their numbers (being more than thou), and by their cavalry (their armies being much made up of horses and chariots, which thou art not allowed to multiply), yet decline not coming to a battle with them, dread not the issue, nor doubt of success." Two things they must encourage themselves with in their wars, provided they kept close to their God and their religion, otherwise they forfeited these encouragements:—(1.) The presence of God with them: "The Lord thy God is with thee, and therefore thou art not in danger, nor needest thou be afraid." See Isa. 41:10. (2.) The experience they and their fathers had had of God’s power and goodness in bringing them out of the land of Egypt, in defiance of Pharaoh and all his hosts, which was not only in general a proof of the divine omnipotence, but to them in particular a pledge of what God would do further for them. He that saved them from those greater enemies would not suffer them to be run down by those that were every way less considerable, and thus to have all he had done for them undone again.2. This encouragement must be particularly addressed to the common soldiers by a priest appointed, and, the Jews say, anointed, for that purpose, whom they call the anointed of the war, a very proper title for our anointed Redeemer, the captain of our salvation: This priest, in God’s name, was to animate the people; and who so fit to do that as he whose office it was as priest to pray for them? For the best encouragements arise from the precious promises made to the prayer of faith. This priest must, (1.) Charge them not to be afraid (v. 3), for nothing weakens the hands so much as that which makes the heart tremble, v. 3. There is need of precept upon precept to this purport, as there is here: Let not your hearts be tender (so the word is), to receive all the impressions of fear, but let a believing confidence in the power and promise of God harden them. Fear not, and do not make haste (so the word is), for he that believeth doth not make more haste than good speed. "Do not make haste either rashly to anticipate your advantages or basely to fly off upon every disadvantage." (2.) He must assure them of the presence of God with them, to own and plead their righteous cause, and not only to save them from their enemies, but to give them victory over them, v. 4. Note, Those have no reason to fear that have God with them. The giving of this encouragement by a priest, one of the Lord’s ministers, intimates, [1.] That it is very fit that armies should have chaplains, not only to pray for them, but to preach to them, both to reprove that which would hinder their success and to raise their hopes of it. [2.] That it is the work of Christ’s ministers to encourage his good soldiers in their spiritual conflict with the world and the flesh, and to assure them of a conquest, yea, more than a conquest, through Christ that loved us.II. Those that were indisposed to fight must be discharged, whether the indisposition did arise,1. From the circumstances of a man’s outward condition; as, (1.) If he had lately built or purchased a new house, and had not taken possession of it, had not dedicated it (v.