Jeremiah 51:1

Yahweh announced that He would arouse against Babylon and Leb-kamai the spirit of a destroyer, or a destroying wind. Leb-kamai (lit. heart of my adversaries) was a code name (atbash) for Chaldea (cf. Jeremiah 51:41; Jeremiah 25:26). Here it functions as a poetic synonym. [Note: Another use of the atbash was to hide the identity of the nation referred to (cf. 1 Peter 5:13).]

"This explanation of the name involves the thought that all enmity against God the Lord culminates in Babylon; on the basis of this representation Babylon is called, Rev. xvii. 5, ’the mother of harlots and abominations of the earth.’" [Note: Keil, 2:289.]