Commentaries:
Barnes' Notes
The Lord of hosts - The God commanding, ordering, marshalling the hosts of heaven - the angels, and the starry worlds. See the notes at Isaiah 1:9. Compare Psalms 24:10. The reference here is to God considered as having control over all "armies," or all that can be regarded and described as a marshalled host, in earth and in heaven. Having such a Being, therefore, for a protector, they had nothing to fear. See Psalms 46:11.
Is with us - Is on our side; is our defender. The Hebrew phrase used here is employed in Isaiah 7:14 (notes); Isaiah 8:8 (notes), to describe the Messiah. See the notes at those passages.
The God of Jacob - See the notes at Psalms 24:6. The meaning is, The God whom Jacob acknowedged, and whom he found to be his friend, is with us.
Is our refuge - literally, a high place, as a tower, far above the reach of enemies. See Psalms 9:9, note; Psalms 18:2, note. So the margin, "an high place for us."
DISCLAIMER: Church of the Great God (CGG) provides these resources to aid the individual in studying the Bible. However, it is up to the individual to "prove all things, and hold fast to that which is good" (I Thessalonians 5:21). The content of these resources does not necessarily reflect the views of CGG. They are provided for information purposes only.