Ezekiel 38:2

² Son of man, set your face toward Gog, of the land of Magog, the prince of Rosh, Meshech, and Tubal, and prophesy against him,

Wall, rampart, gates, and bars

In Lamentations 2:8-9, the 'wall,' 'rampart,' 'gates,' and 'bars' signify doctrines.