10 Pa. Stat. § 121
All sales, gifts or grants, made of any lands or tenements within the province of Pennsylvania, to any person or persons, in trust, for sites of churches, houses of religious worship, schools, alms-houses, and for burying grounds, or for any of them, shall be and are hereby ratified and confirmed to the person or persons to whom the same were sold, given or granted, their heirs and assigns, in trust nevertheless, and for the use of the respective religious societies, for whose use the same were at first sold, given, granted or purchased, according to the true intent and meaning of such gifts and grants; and that every sale, gift, grant or devise, of any such trustee or trustees, or any person or persons, in whose name or names the said lands for erecting churches, houses of religious worship, schools, alms-houses, or burying grounds, within this province, were purchased, taken or accepted, or the heirs or assigns of such trustees, shall be and are hereby declared to be for the sole use, benefit and behoof of the said respective societies, who have been in the peaceable possession of the same for the space of twenty-one years, next before the tenth day of June, 1730, or for whose use the same were at first given, granted or devised, and no other.
10 P.S. § 121