Jerome — on 1Pet 3:18-19 (Commentariorum In Epistolam Beati Pauli Ad Ephesios, Book 2, on Ephesians 4:9)

“But the lower parts of the earth, hell, are understood to be where our Lord and Savior descended, so that He might lead with Him to the heavens the souls of the saints who were being held captive there. Hence, after His resurrection, many bodies of the righteous were seen in the holy city (Matthew 27:52-53). And that hell is in the lower part of the earth is attested by the Psalmist who says: "The earth opened and swallowed up Dathan and covered the congregation of Abiron" (Psalm 106:17). This is also explained more fully in the Book of Numbers (chapter 16). In another place we read: "Let death come upon them and let them go down alive into hell" (Psalm 55:15).”