2 Kings 2:7
Fifty men of the sons of the prophets also went and stood at some distance from them, as they both were standing by the Jordan.
1 Kings 18:4
and when Jezebel cut off the prophets of the LORD, Obadiah took a hundred prophets and hid them by fifties in a cave and fed them with bread and water.)
1 Kings 18:13
Has it not been told my lord what I did when Jezebel killed the prophets of the LORD, how I hid a hundred men of the LORD's prophets by fifties in a cave and fed them with bread and water?
2 Kings 2:17
But when they urged him till he was ashamed, he said, "Send." They sent therefore fifty men. And for three days they sought him but did not find him.