The Sacred Tradition of the Orthodox Church teaches that the Apostles themselves established the practice of anointing with chrism in place of the laying on of hands when bestowing the sacrament. As the numbers of converts grew, it became physically impossible for the apostles to lay hands upon each of the newly baptized. So the Apostles laid hands upon a vessel of oil, bestowing the Holy Spirit upon it, which was then distributed to all of the presbyters (priests) for their use when they baptized. This same chrism is in use to this day, never being completely depleted but newly consecrated chrism only being added to it as needed (this consecration traditionally is performed only by the primates of certain autocephalous churches on Great Thursday) and it is believed that chrism in use today contains some small amount of the original chrism made by the apostles.