John Calvin Commentary Isaiah 2:13

"and upon all the cedars of Lebanon, that are high and lifted up, and upon all the oaks of Bashan," — Isaiah 2:13 (ASV)

Upon all the cedars of Lebanon. The allegory introduced here, concerning the trees of Lebanon and the lofty mountains, instead of obscuring the subject, sheds light on it. For however high the wishes or endeavors of a mortal man may be, he will never be able to reach the height of the mountains and the lofty trees, which it is as easy for God to throw down as it is for a breath of wind to scatter fallen leaves.

Accordingly, in what may be called a vivid depiction, Isaiah shows proud men how futile and foolish they are in believing that their elevation will be their defense. There is also an implied exaggeration, which must have contributed to heightening the terror.

It cannot be supposed that God is actually angry with the mountains and trees, or that, having changed his purpose, he throws down what he has built up; rather, through these harmless creations, Isaiah displays God's judgment to convince wicked and unprincipled men more fully that their presumption will not go unpunished. Thus, we see the reason why he mixes the metaphors of cedars, oaks, and mountains.