Numbers 21:27

27That is why those who speak in proverbs
Proverbs of antiquity could include pithy sayings or longer songs, riddles, or poems composed to catch the significance or the irony of an event. This is a brief poem to remember the event, like an Egyptian victory song. It may have originated as an Amorite war taunt song; it was sung to commemorate this victory. It was cited later by Jeremiah (48:45–46). The composer invites his victorious people to rebuild the conquered city as a new capital for Sihon. He then turns to address the other cities which his God(s) has/have given to him. See P. D. Hanson, “The Song of Heshbon and David’s Nir,” HTR 61 (1968): 301.
say,

“Come to Heshbon, let it be built.
Let the city of Sihon be established!
Meaning, “rebuilt and restored.”

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