The canon on a bishop and his own see
The canon forbidding a bishop to leave the see for which he was ordained. The Diocese's own teaching material foregrounds this canon at Constantinople.
it is not permitted that a bishop leave his diocese for another even if he be constrained to do so, unless there be a very good reason for that, such as his greater usefulness to the other See. In such a case the decision must not be made by him alone but through the judgment and exhortations of numerous bishops
The Diocese's own teaching material foregrounds this canon at Constantinople. A bishop belongs to the see for which he was ordained, and may not simply move to another, and even a good reason is judged by many bishops rather than by himself.
HIS 102, Coptic Orthodox Diocese of the Southern United States, 2004