The word inquire lets us know that Zedekiah did not send to the prophet only to pray for him, but to inquire of God what the issue would be of this future contingency; it may be more desirous to know that, than that Jeremiah should intercede with God for them. The prophet tells them from God that the king of Egypt's army should do them no service; it is expounded, Ezekiel 17:17, He should not make for him in the war, by casting up mounts, and building forts, to cut off many persons. Probably the Egyptian army, upon the sight of the strength of the Chaldeans, and the weak and impotent state of the Jews, were discouraged, and would not adventure to fight them, but by and by returned to their own land.
Related Commentaries of Jeremiah 37:7
Jeremiah 37:7
7 Thus saith the LORD, the God of Israel; Thus shall ye say to the king of Judah, that sent you unto me to enquire of me; Behold, Pharaoh's army, which is come forth to help you, shall return to Egypt into their own land.