Canon 15 A cleric may not serve in two churches

From now on let a cleric not be enrolled in two churches; for this is proper to trade and base gain, and foreign to ecclesiastical custom. For we have heard from the very voice of the Lord that: No one can serve two lords; for either he will hate the one and love the other, or he will hold to the one and despise the other. Each one, then, according to the apostolic voice, in that in which he was called, in this ought to remain, and to attend in one church. For the things that are done for base gain in ecclesiastical matters stand estranged from God. For the need of this life there are various occupations. From these, then, if anyone wishes, let him provide the necessities of the body; for the Apostle said: To my needs, and to those who were with me, these hands have ministered. And this holds in this God-guarded city; but in the country places outside, because of the lack of men, let it be allowed.