2 Chronicles 36:9

Jehoiachin was eight years old when he began to reign, and he reigned three months and ten days in Jerusalem: and he did that which was evil in the sight of the LORD.

Jehoiachin was eight years old - called also Jeconiah or Coniah (Jeremiah 22:23). "Eight" should have been 'eighteen,' probably from a mistake in transcribing the numeral letters of the Hebrew text (Kennecott), as appears from 2 Kings 24:8, and also from the full development of his ungodly principles and habits (see Ezekiel 19:5). His reign being of so short duration cannot be considered at variance with the prophetic denunciation against his father (Jeremiah 36:30). But his appointment by the people gave umbrage to Nebuchadnezzar, who, "when the year was expired" (2 Chronicles 36:10) - i:e., in the spring, when campaigns usually began-came in person against Jerusalem, captured the city, and sent Jehoiachin in chains to Babylon, removing at the same time all the nobles and most skillful artisans, pillaging all the remaining treasures both of the temple and palace (see the notes at 2 Kings 24:8).