Whedon's Commentary on the Bible - Isaiah 26:4
4. And as if from heaven comes the encouragement to Israel to trust in the Lord for ever, to permit it on no occasion to fail. For in the Lord Jehovah Original, Jah Jehovah. On this combination, see note at Isaiah 12:2. Delitzsch regards the two names as the proper name of God the Redeemer in the most emphatic form. read more
Whedon's Commentary on the Bible - Isaiah 26:3
3. Keep… in perfect peace The original has it, Peace, peace. Psalms 112:7-8, is the source of the thought here. The new Israel knows that Jehovah preserves him in enduring and intensified peace, because he knows his trust in Jehovah is perfect. read more