Amos 5:19

¹⁹ As if a man did flee from a lion, and a bear met him; or went into the house, and leaned his hand on the wall, and a serpent bit him.

Wall, rampart, gates, and bars

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