What does the Bible say about Zion as a stronghold?

Zion is first mentioned in 2 Samuel 5, where King David captures it from the Jebusites after it had remained unconquered for 400 years. This stronghold represents both a geographical location and a spiritual reality where God's presence dwells. Significantly, the Lord has chosen Zion as His habitation, indicating a divine purpose and a place of rest for His people. From its initial status as a stronghold of the enemy, Zion becomes the city of David, a center of worship and God's dwelling place, illustrating God's redemptive plan in transforming defiance into fellowship.