For it was so, when Jezebel cut off the prophets of the LORD, that Obadiah took an hundred prophets, and hid them by fifty in a cave, and fed them with bread and water.)
An hundred prophets - not men endowed with the extraordinary gifts of the prophetic office, but who were devoted to the service of God, preaching, praying, praising, etc. (1 Samuel 10:10-12).
Fed them with bread and water. These articles are often used to include sustenance of any kind. Since this succour must have been given them at the hazard, not only of his place, but his life, it was a strong proof of his attachment to the true religion.