The Fourth Ecumenical Council.  The Council of Chalcedon 17Canon II.

If any Bishop should ordain for money, and put to sale a grace which cannot be sold, and for money ordain a bishop, or chorepiscopus, or presbyters, or deacons, or any other of those who are counted among the clergy; or if through lust of gain he should nominate for money a steward, or advocate, or prosmonarius, or any one whatever who is on the roll of the Church, let him who is convicted of this forfeit his own rank; and let him who is ordained be nothing profited by the purchased ordination or promotion; but let him be removed from the dignity or charge he has obtained for money. And if any one should be found negotiating such shameful and unlawful transactions, let him also, if he is a clergyman, be deposed from his rank, and if he is a layman or monk, let him be anathematized.