The LORD of hosts is with us; the God of Jacob is our refuge. Selah. The Lord of hosts is with us - Having heard these declarations of God, the people cry out with joy and exultation, The Lord of hosts, the God of armies, is with us; we will not fear what man can do unto us.
The God of Jacob is our refuge - He who saved our fathers will save us, and will never abandon his people in distress.
Selah - This is a firm, lasting, unshaken, well-tried truth.
Commentary on the Bible, by Adam Clarke [1831].