What does Isaiah 26:4 mean?

This song will be sung in the land of Judah after the Lord has defeated His enemies and taken the throne as King. This is typically associated with the millennial kingdom, ruled by Christ during the end times. This passage is also meant to encourage the Lord's people to put their full trust in Him today (Isaiah 26:1–2). Isaiah declared that the Lord provides absolute assurance to those who keep their minds focused on Him.

This peace is not just a fleeting feeling. Nor is it just about an internal peace. The Lord's salvation and protection from external destruction is real and eternal (Isaiah 26:3). The Lord's people should trust in the Lord forever: God is an enduring rock. In other words, He is worthy of our trust because He is strong, permanent, and secure. The Lord God is the safe place that will never become treacherous. He is the fortress set on the mountain that will never be moved. And He is the high ground the enemy will never reach.

Israel frequently described the Lord as the Rock who would save them:

"The Rock, his work is perfect, for all his ways are justice" (Deuteronomy 32:4).

"For their rock is not as our Rock; our enemies are by themselves" (Deuteronomy 32:31).

"There is none holy like the Lord: for there is none besides you; there is no rock like our God" (1 Samuel 2:2).

"The Lord is my rock and my fortress and my deliverer, my God, my rock, in whom I take refuge, my shield, and the horn of my salvation, my stronghold" (Psalm 18:2).

"Hear my cry, O God, listen to my prayer; from the end of the earth I call to you when my heart is faint. Lead me to the rock that is higher than I, for you have been my refuge, a strong tower against the enemy" (Psalm 61:1–3).

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