'Fifties' in the Bible

and God turneth round the people the way of the wilderness of the Red Sea, and by fifties have the sons of Israel gone up from the land of Egypt.

Moreover thou shalt provide out of all the people able men, such as fear God, men of truth, hating covetousness; and place such over them, to be rulers of thousands, and rulers of hundreds, rulers of fifties, and rulers of tens:

And Moses chose able men out of all Israel, and made them heads over the people, rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens.