They that speak in proverbs. הַמָּשְׁלִים. Septuagint, οἰ αἰνιγματισταί. A class of persons well marked among the Hebrews, as perhaps in all ancient countries. It was their gift, and almost their profession, to express in the sententious, antistrophic poetry of the age such thoughts or such facts as took hold of men's minds.
At a time when there was little difference between poetry and rhetoric, and when the distinction was hardly drawn between the inventive faculty of man and the Divine afflatus, it is not surprising to find the word mashal applied to the rhapsody of Balsam (Numbers 23:7), to the "taunting song" of Isaiah (Isaiah 14:4), to the "riddle" of Ezekiel (Ezekiel 17:2), as well as to the collection of earthly and heavenly wisdom in the Book of Proverbs.
That which follows is a taunting song, most like to the one cited from Isaiah, the archaic character of which is marked by its strongly antithetic form and abrupt transitions, as well as by the peculiarity of some of the words.
Come to Heshbon. This may be ironically addressed to the Amorites, lately so victorious, now so overthrown; or, possibly, it may be intended to express the jubilation of the Amorites themselves in the day of their pride.