Jamieson, Fausset and Brown on 2 Chronicles 36:13

13. who had made him swear by God--Zedekiah received his crown on the express condition of taking a solemn oath of fealty to the king of Babylon (Eze 17:13); so that his revolt by joining in a league with Pharaoh-hophra, king of Egypt, involved the crime of perjury. His own pride and obdurate impiety, the incurable idolatry of the nation, and their reckless disregard of prophetic warnings, brought down on his already sadly reduced kingdom the long threatened judgments of God. Nebuchadnezzar, the executioner of the divine vengeance, commenced a third siege of Jerusalem, which, after holding out for a year and a half, was taken in the eleventh year of the reign of Zedekiah. It resulted in the burning of the temple, with, most probably, the ark, and in the overthrow of the kingdom of Judah (see on 2Ki 25:1-7; Eze 12:13; Eze 17:16).