Complete Commentary on the Whole Bible, by Matthew Henry, at sacred-texts.com
(Jos 1:1-4) The Lord appoints Joshua to succeed Moses.
(Jos 1:5-9) God promises to assist Joshua.
(Jos 1:10-15) Preparation to pass over Jordan.
(Jos 1:16-18) The people promise to obey Joshua.
Joshua had attended upon Moses. He who was called to honour, had been long used to business. Our Lord Jesus took upon him the form of a servant. Joshua was trained up under command. Those are fittest to rule, who have learned to obey. The removal of useful men should quicken survivors to be the more diligent in doing good. Arise, go over Jordan. At this place and at this time the banks were overflowed. Joshua had no bridge or boats, and yet he must believe that God, having ordered the people over, would open a way.
Joshua is to make the law of God his rule. He is charged to meditate therein day and night, that he might understand it. Whatever affairs of this world we have to mind, we must not neglect the one thing needful. All his orders to the people, and his judgments, must be according to the law of God. Joshua must himself be under command; no man's dignity or dominion sets him above the law of God. He is to encourage himself with the promise and presence of God. Let not the sense of thine own infirmities dishearten thee; God is all-sufficient. I have commanded, called, and commissioned thee to do it, and will be sure to bear thee out in it. When we are in the way of duty, we have reason to be strong and very bold. Our Lord Jesus, as Joshua here, was borne up under his sufferings by a regard to the will of God, and the commandment from his Father.
Joshua says to the people, Ye shall pass over Jordan, and shall possess the land; because God had said so to him. We honour the truth of God, when we stagger not at the promise of God. The two tribes and a half were to go over Jordan with their brethren. When God, by his providence, has given us rest, we ought to consider what service we may do to our brethren.
The people of Israel engage to obey Joshua; All that thou commandest us to do we will readily do, without murmuring or disputing, and whithersoever thou sendest us we will go. The best we can ask of God for our magistrates, is, that they may have the presence of God; that will make them blessings to us, so that in seeking this for them, we consult our own interest. May we be enabled to enlist under the banner of the Captain of our salvation, to be obedient to his commands, and to fight the good fight of faith, with all that trust in and love his name, against all who oppose his authority; for whoever refuses to obey him must be destroyed.