The earth shook as the nations transitioned from falsehood to truth, and the Apostles, akin to the heavens, poured forth the waters of their preaching to nourish souls. The Apostles indeed were like the heavens, focusing on divine matters and transcending worldly concerns.
The conjunction 'for' here is unnecessary. In the words of Cyril, this should be taken literally: when God liberated Israel from the toil of Egypt and led them into the wilderness, the earth reacted strongly to the miraculous events that unfolded. The rivers turned to blood, hail fell from the sky, the sea parted, and manna rained down, a miraculous bread given exclusively to the Israelites. Athanasius remarks that this indicates He who descended to the realm of the dead, even in ancient times, was the one who delivered Israel from Egypt through Moses. He states, "When You went forth at the exodus of Your people from Egypt, the earth trembled," meaning that their departure was heard across the land, originating from the presence of the God of Sinai, from the presence of the God of Israel. He refers to the face of God to emphasize that all these wonders were accomplished by the true God, the Creator of both Mount Sinai and Israel. By recalling the names of Sinai and Israel, He signifies that the God who performed great miracles on Sinai and revealed Himself to Jacob is the same one who continues to work these wonders, not a different deity, but the one and only true God.