Nicæa I: canon XVII

Since many enrolled [among the clergy] have been induced by greed and avarice to forget the sacred text, "who does not put out his money at interest", and to charge one per cent [a month] on loans, this holy and great synod judges that if any are found after this decision to receive interest by contract or to transact the business in any other way or to charge [a flat rate of] fifty per cent or in general to devise any other contrivance for the sake of dishonourable gain, they shall be deposed from the clergy and their names struck from the roll.