Isaiah 26:3

1In that day, this song will be sung in the land of Judah: “We have a strong city. God appoints salvation for walls and bulwarks. 2Open the gates, that the righteous nation may enter: the one which keeps faith. 3You will keep whoever’s mind is steadfast in perfect peace, because he trusts in you. 4Trust in the LORD forever; for in the LORD, the LORD, is an everlasting Rock. 5For he has brought down those who dwell on high, the lofty city. He lays it low. He lays it low even to the ground. He brings it even to the dust.