Deuteronomy 2:24-25 ‘Rise up, set out on your journey and go over the Valley of the Arnon. Behold, I have given into your hand Sihon the Amorite, king of Heshbon, and his land. Begin to take possession, and contend with him in battle. This day I will begin to put the dread and fear of you on the peoples who are under the whole heaven, who shall hear the report of you and shall tremble and be in anguish because of you.’
Jeremiah 27:5 “It is I who by my great power and my outstretched arm have made the earth, with the men and animals that are on the earth, and I give it to whomever it seems right to me.
Daniel 4:17 The sentence is by the decree of the watchers, the decision by the word of the holy ones, to the end that the living may know that the Most High rules the kingdom of men and gives it to whom he will and sets over it the lowliest of men.’
God worked behind the scenes in hardening the heart of Sihon, the King of the Amorites. It was right for God to do this because the Creator has the right to do whatever He pleases with His creatures. But it was also right because of the way God did it. God did not persuade a reluctant Sihon to act out against Israel; God simply let Sihon’s heart take the evil way it wanted to take. God did not change Sihon’s heart from good to bad but hardened it in its malice towards Israel. This explains why God hardened the heart of Sihon. God led Sihon into the destructive course that his heart desired so that the land of the Amorites became the possession and inheritance of Israel. (Guzik)
God tried his people, by forbidding them to meddle with the rich countries of Moab and Ammon. He gives them possession of the country of the Amorites. If we keep from what God forbids, we shall not lose by our obedience. The earth is the Lord’s and the fulness thereof; and he gives it to whom he pleases; but when there is no express direction, none can plead his grant for such proceedings. Though God assured the Israelites that the land should be their own, yet they must contend with the enemy. What God gives we must endeavour to get. What a new world did Israel now come into! Much more joyful will the change be, which holy souls will experience, when they remove out of the wilderness of this world to the better country, that is, the heavenly, to the city that has foundations. Let us, by reflecting upon God’s dealings with his people Israel, be led to meditate upon our years spent in vanity, through our transgressions. But happy are those whom Jesus has delivered from the wrath to come. To whom he hath given the earnest of his Spirit in their hearts. Their inheritance cannot be affected by revolutions of kingdoms, or changes in earthly possessions. (Henry)