'Fifty' in the Bible

"A certain lender had two debtors. The one owed five hundred denarii, and the other fifty.

For they were about five thousand men. He said to his disciples, "Make them sit down in groups of about fifty each."

He said, 'A hundred batos of oil.' He said to him, 'Take your bill, and sit down quickly and write fifty.'

The Jews therefore said to him, "You are not yet fifty years old, and have you seen Abraham?"

When he had destroyed seven nations in the land of Canaan, he gave them their land for an inheritance, for about four hundred fifty years.

Many of those who practiced magical arts brought their books together and burned them in the sight of all. They counted the price of them, and found it to be fifty thousand pieces of silver.