Matthew Poole and continuators on Jeremiah 37:5

5 Then Pharaoh's army was come forth out of Egypt, and when the Chaldeans that besieged Jerusalem, heard tidings of them, they departed from Jerusalem .

Zedekiah was set up by the King of Babylon, instead of Iehoiachin, whom the King of Babylon had carried into Babylon, Zedekiah (as is usual in those cases, and as it appeareth, Ezek. 17.16.) had taken an Oath of Allegia[illegible: 1 letter]ce to the King of Babylon, but brake it, and the Covenant which he made with him, ver. 16. and ver 15. reb[illegible: 1 letter]lled against him, and sent his Embassador into Egypt for Horses, and much people. Now the King of Egypt came in person no more after the great overthrow given him, in Carchemish by the River Euphrates, of which we read chap. 46.2. which was 13 or 14 years before this, yet he sent an Army at Zedekiah's request to relieve him, at this time besieged by the Armies of the King of Babylon. The Chaldaeans that were in the siege of Jerusalem hearing of it, raised the siege for a time, during which time (probably) it was that Zedekiah sent to the Prophet to pray for them.

Marginal references: chap. 34.21.