Son of man, write thee the name of the day, even of this same day: the king of Babylon set himself against Jerusalem this same day.
Son of man, Write thee the name of the day, even of this same day. Ezekiel proves his divine mission by announcing the very day ("this same day") of the beginning of the investment the city by Nebuchadnezzar - "the ninth year," namely, of Jehoiachin's captivity, "the tenth day of the tenth month," - though he was at the time 300 miles away from Jerusalem, among the captives at the Chebar (2 Kings 25:1; Jeremiah 39:1).
The king of Babylon set himself against Jerusalem - i:e., laid siege to Jerusalem; literally, 'lay against.'