3. She looks back upon God's former appearances, and compares this with them, the more to magnify the glorious author of this great salvation. What God is doing should bring to our mind what he has done; for he is the same yesterday, to-day, and for ever (v. 4): Lord, when thou wentest out of Seir. This may be understood either, (1.) Of the appearances of God's power and justice against the enemies of Israel to subdue and conquer them; and so Hab. iii. 3, 4, &c., is parallel to it, where the destruction of the church's enemies is thus described. When God had led his people Israel from the country of Edom he brought down under their feet Sihon and Og, striking them and their armies with such terror and amazement that they seemed apprehensive heaven and earth were coming together. Their hearts melted, as if all the world had been melting round about them. Or it notes the glorious displays of the divine majesty; and the surprising effects of the divine power, enough to make the earth tremble, the heavens drop like snow before the sun, and the mountains to melt. Compare Ps. xviii. 7. God's counsels are so far from being hindered by any creature that, when the time of their accomplishment comes, that which seemed to stand in their way will not only yield before them, but be made to serve them. See Isa. lxiv. 1, 2. Or, (2.) It is meant of the appearances of God's glory and majesty to Israel, when he gave them his law at Mount Sinai. It was then literally true, the earth trembled, and the heavens dropped, &c. Compare Deut. xxxiii. 2; Ps. lxviii. 7, 8. Let all the kings and princes know that this is the God whom Deborah praises, and not such mean and impotent deities as they paid their homage to. The Chaldee paraphrase applies it to the giving of the law, but has a strange descant on those words, the mountains melted. Tabor, Hermon, and Carmel, contended among themselves: one said, Let the divine majesty dwell upon me; the other said, Let it dwell upon me; but God made it to dwell upon Mount Sinai, the meanest and least of all the mountains. I suppose it means the least valuable, because barren and rocky.