Keil & Delitzsch, on Jer 51:53

“If Babylon should mount up to heaven, and establish her strength on high: from me there should come spoilers upon her, saith the Lord.”

“Babylon shall by no means escape punishment. Even though it mounted up to heaven (cf. Job 20:6; there may, at the same time, be an allusion to Isa 14:12, and possibly also to the tower at Babylon), and תּבצּר, "cut off (i.e., made inaccessible) the height of its strength," i.e., the height in which its strength consists, its lofty wall of defence (probably an allusion to the lofty walls of Babylon; see on Jer 51:58), yet destroyers are to come against it from Jahveh.”

Imported from an open dataset — not yet checked against the printed edition.