Thou art beautiful, O my love, as Tirzah, comely as Jerusalem, terrible as an army with banners.
Tirzah - meaning pleasant, from the Hebrew raatsah (H7521) (Hebrews 13:21). The Church is "a city set on an hill," "well-pleasing" to God (Matthew 5:14). The royal city of one of the old Canaanite kings (Joshua 12:24); and after the revolt of Israel the royal city of its kings, before Omri rounded Samaria (1 Kings 16:8; 1 Kings 16:15). No ground for assigning a later date than the time of Solomon to the Song, as Tirzah was even in his time the capital of the North (Israel), as Jerusalem was of the South (Judah).
Jerusalem - residence of the kings of Judah, as Tirzah, of Israel (Psalms 48:1). Loveliness, security, unity, and loyalty; also the union of Israel and Judah in the Church (Isaiah 11:13).
Terrible - awe-inspiring. Not only armed as a city on the defensive, but as an army on the offensive. Led on by the Church's 'Standard-bearer' (Song of Solomon 5:10, note).
Banners (Psalms 60:4; Exodus 17:14-15, margin) - Jehovah-Nissi (2 Corinthians 10:4).