Oecumenius

But the earth helped the woman by opening its mouth and swallowing the river that the Dragon had spewed out of his mouth against the woman. The earth swallowing the river signifies that the temptation was accepted within her, that is, the Lord was put to death. But the Dragon was not helped by this; rather, in restoring the Lord again, He came to life after three days, having conquered death, since it was not possible for death to hold Him (see Acts 2:24), who is "the author of life," according to the divine Peter. …

Commentary on Revelation ↗

Bede

And the earth opened its mouth and swallowed up the flood. This earth is the holy flesh of the Lord, which, swallowing the death that temporarily prevailed over it, taught us also to swallow it. It can also be understood as the Church, whose admonitions and prayers of the mouth ward off the enemy's snares.

Commentary on Revelation ↗

Victorinus of Pettau

"And the earth helped the woman, and opened her mouth, and swallowed up the flood which the dragon cast out of his mouth." That the earth opened her month and swallowed up the waters, sets forth the vengeance for the present troubles. Although, therefore, it may signify this woman bringing forth, it shows her afterwards flying when her offspring is brought forth, because both things did not happen at one time; for we know that Christ was born, but that the time should arrive that she should flee from the face of the serpent: (we do …

Commentary on the Apocalypse of the Blessed John ↗