Matthew Poole and continuators on Jeremiah 21:2

2 Enquire I pray thee of the LORD for us , (for Nebuchadrezzar king of Babylon maketh war against us) if so be that the LORD will deal with us according to all his wondrous works, that he may go up from us .

Zedekiah, as he was none of the best so he was none of the worst of the Kings of Iudah, he had some convictions, and impressions (possibly from his education) not worn off, and having some reverence of God, he sends to the Prophet to enquire of the Lord.

Because the King of Babylon was come up to make war against them. It is true the greatest Contemners of God and his faithful Ministers, will sometimes, in great straits, chuse to send for them rather than those who in their prosperity pleased them. Hence we read of Saul when he went to the Witch at Endor, desiring that Samuel might be raised up; but in Zedekiahs whole story we read no such eminent contempt of God, but a disobedience to the commands of God, proceeding rather from his easiness to be ruled by his corrupt Court, than from a stubbornness in himself.

By mentioning Gods former wondrous works, possibly he may have a respect to Gods raising Senacheribs Siege in the time of his Grandfather Hezekiah. The remembring of Gods former wondrous works, is of use to raise in us an hope and confidence in God for further deliverances, supposing our selves under the same circumstances of Obedience to Gods Will, otherwise not, as we shall see in the case of Iudah and its King, at this time; therefore Zedekiah saith, if so be. Guilt of sin hinders Confidence, and holy boldness in the best; but as the guilt is greater, so the hope or confidence of any is justly less.