2 Kings 2:7
Fifty men of the sons of the prophets also went and stood opposite them [to watch] at a distance; and the two of them stood by the Jordan.
1 Kings 18:4
for when Jezebel destroyed the prophets of the Lord, Obadiah took a hundred prophets and hid them by fifties in a cave, and provided them with bread and water.)
1 Kings 18:13
Has it not been told to my lord [Elijah] what I did when Jezebel killed the prophets of the Lord, how I hid a hundred of the Lord’s prophets by fifties in a cave, and provided them with bread and water?
2 Kings 2:17
But when they urged him until he was embarrassed [to refuse them], he said, “Send them.” So they sent fifty men, and they searched for three days but did not find Elijah.