Charles Ellicott Commentary Nahum 1:3

"Jehovah is slow to anger, and great in power, and will by no means clear [the guilty]: Jehovah hath his way in the whirlwind and in the storm, and the clouds are the dust of his feet." — Nahum 1:3 (ASV)

And great in power. —Better, but great in power. Jehovah’s forbearance is not attributable to weakness. To vindicate His power, Nahum, after the manner of other Hebrew poets and prophets, reverts to the wonders of the Exodus (Nahum 1:4–5). The pillars of cloud and fire in the desert march; the quaking cliffs of Sinai; the Red Sea and Jordan divided at His word; Canaan succumbing at every point, upwards to mighty Lebanon in the north, and across from Eastern Bashan to Western Carmel—these are the testimonies to Jehovah’s might. (Compare to Habakkuk 3:6-10.)