Ellicott's Commentary for English Readers - 2 Samuel 22:8
(8) Of heaven.—Psalms 18:0, “of the hills.” The thought is the same, but the strong poetic figure by which the mountains are spoken of as “the pillars of heaven” (comp. Job 26:11) is softened in the psalm. read more
John Dummelow's Commentary on the Bible - 2 Samuel 22:1-51
David’s Thanksgiving PsalmThis beautiful poem has also been preserved as the Eighteenth Psalm. It probably belongs to the earlier portion of David’s reign, when his conquests and God’s promise (2 Samuel 7) were still fresh in his mind. See on Psalms 18. read more