21 Then Israel sent messengers to King Sihon of the Amorites, saying, 22 "Let me pass through your land; we will not turn aside into field or vineyard; we will not drink the water of any well; we will go by the King's Highway until we have passed through your territory." 23 But Sihon would not allow Israel to pass through his territory. Sihon gathered all his people together, and went out against Israel to the wilderness; he came to Jahaz, and fought against Israel. 24 Israel put him to the sword, and took possession of his land from the Arnon to the Jabbok, as far as to the Ammonites; for the boundary of the Ammonites was strong. 25 Israel took all these towns, and Israel settled in all the towns of the Amorites, in Heshbon, and in all its villages. 26 For Heshbon was the city of King Sihon of the Amorites, who had fought against the former king of Moab and captured all his land as far as the Arnon. 27 Therefore the ballad singers say, "Come to Heshbon, let it be built; let the city of Sihon be established. 28 For fire came out from Heshbon, flame from the city of Sihon. It devoured Ar of Moab, and swallowed up the heights of the Arnon. 29 Woe to you, O Moab! You are undone, O people of Chemosh! He has made his sons fugitives, and his daughters captives, to an Amorite king, Sihon. 30 So their posterity perished from Heshbon to Dibon, and we laid waste until fire spread to Medeba."
31 Thus Israel settled in the land of the Amorites. 32 Moses sent to spy out Jazer; and they captured its villages, and dispossessed the Amorites who were there. 33 Then they turned and went up the road to Bashan; and King Og of Bashan came out against them, he and all his people, to battle at Edrei. 34 But the Lord said to Moses, "Do not be afraid of him; for I have given him into your hand, with all his people, and all his land. You shall do to him as you did to King Sihon of the Amorites, who ruled in Heshbon." 35 So they killed him, his sons, and all his people, until there was no survivor left; and they took possession of his land.
Matthew Henry's Commentary on Numbers 21:21-35
Commentary on Numbers 21:21-35
(Read Numbers 21:21-35)
Sihon went with his forces against Israel, out of his own borders, without provocation, and so ran upon his own ruin. The enemies of God's church often perish by the counsels they think most wisely taken. Og, king of Bashan, instead of being warned by the fate of his neighbours, to make peace with Israel, makes war with them, which proves in like manner his destruction. Wicked men do their utmost to secure themselves and their possessions against the judgments of God; but all in vain, when the day comes on which they must fall. God gave Israel success, while Moses was with them, that he might see the beginning of the glorious work, though he must not live to see it finished. This was, in comparison, but as the day of small things, yet it was an earnest of great things. We must prepare for fresh conflicts and enemies. We must make no peace or truce with the powers of darkness, nor even treat with them; nor should we expect any pause in our contest. But, trusting in God, and obeying his commands, we shall be more than conquerors over every enemy.