Charles Ellicott Commentary Psalms 68:2

"As smoke is driven away, so drive them away: As wax melteth before the fire, So let the wicked perish at the presence of God." — Psalms 68:2 (ASV)

Smoke. — The figure of the vanishing smoke has occurred before ; for that of the melting wax, see Psalms 97:5. Both figures are too obvious to need reference to the cloud and fire of the ancient encampment.