Second Council of Nicaea, Canon XII

That a Bishop or Hegumenos ought not to alienate any part of the suburban estate of the church.

If bishop or hegumenos is found alienating any part of the farm lands of the bishoprick or monastery into the hands of secular princes, or surrendering them to any other person, such act is null according to the canon of the holy Apostles, which says:  “Let the bishop take care of all the Church’s goods, and let him administer the same according as in the sight of God.”  It is not lawful for him to appropriate any part himself, or to confer upon his relations the things which belong to God.  If they are poor let them be helped among the poor; but let them not be used as a pretext for smuggling away the Church’s property.  And if it be urged that the land is only a loss and yields no profit, the place is not on that account to be given to the secular rulers, who are in the neighbourhood; but let it be given to clergymen or husbandmen.  And if they have resorted to dishonest craft, so that the ruler has bought the land from the husbandman or cleric, such transaction shall likewise be null, and the land shall be restored to the bishoprick or monastery.  And the bishop or hegumenos doing this shall be turned out, the bishop from his bishoprick and the hegumenos from his monastery, as those who wasted what they did not gather.

Translation: Henry R. Percival, The Seven Ecumenical Councils, NPNF II.14 (1900), via CCEL.