2 Kings 2:7
And fifty men of the sons of the prophets went out and took their places facing them a long way off, while the two of them were by the edge of Jordan.
1 Kings 18:4
For when Jezebel was cutting off the prophets of the Lord, Obadiah took a hundred of them, and kept them secretly in a hole in the rock, fifty at a time, and gave them bread and water.)
1 Kings 18:13
Has my lord not had word of what I did when Jezebel was putting the Lord's prophets to death? how I kept a hundred of them in a secret hole in the rock, fifty at a time, and gave them bread and water?
2 Kings 2:17
But when they kept on requesting him, he was shamed and said, Send, then. So they sent fifty men; but after searching for three days, they came back without having seen him.