Jeremiah 25:26

Sheshach] Sheshach stands in all probability for Babel (or Babylon). The Jews had a species of cypher writing, the form of which consisted in substituting the last letter of the Hebrew alphabet for the first, the last but one for the second, and so on. Omitting vowels, we find that thus Sh, Sh, Ch will represent B, B, L: cp. Jeremiah 51:41, where Sheshach and Babylon stand in parallel clauses. Another instance of the cypher is in Jeremiah 51:1, where the Heb. for 'in the midst of them that rise up against me' becomes, when thus transmuted, 'Casdim,' i.e. Chaldeans.

30-38. Judgment shall come upon all the peoples of the earth.