§1. A cleric who has legitimately moved from his own particular church to another is incardinated in the latter particular church by the law itself after Five years if he has made such a desire known in writing both to the diocesan bishop of the host church and to his own diocesan bishop and neither of them has expressed opposition in writing to him within four months of receiving the letter.
§2. Through perpetual or definitive admission into an institute of consecrated life or into a society of apostolic life, a cleric who is incardinated in the same institute or society according to the norm of can. 266, §2 is excardinated from his own particular church.
Source: Code of Canon Law (Vatican.va)