John Wesley on Numbers 21:27

In proverbs - The poets or other ingenious persons, of the Amorites or Canaanites, who made this following song of triumph over the vanquished Moabites: which is here brought in, as a proof that this was now Sihon's land, and as an evidence of the just judgment of God in spoiling the spoilers, and subduing those who insulted over their conquered enemies. Come into Heshbon - These are the words either of Sihon speaking to his people, or of the people exhorting one another to come and possess the city which they had taken. Of Sihon - That which once was the royal city of the king of Moab, but now is the city of Sihon.