From Instruction Redemptionis Sacramentum
It is not licit for the faithful “to take . . . by themselves . . . and, still less, to hand . . . from one to another” the sacred host or the sacred chalice.[181] Moreover, in this regard, the abuse is to be set aside whereby spouses administer Holy Communion to each other at a Nuptial Mass.
The communicant must not be permitted to intinct the host himself in the chalice, nor to receive the intincted host in the hand. As for the host to be used for the intinction, it should be made of valid matter, also consecrated; it is altogether forbidden to use non-consecrated bread or other matter.
The Priest, once he has returned to the altar after the distribution of Communion, standing at the altar or at the credence table, purifies the paten or ciborium over the chalice, then purifies the chalice in accordance with the prescriptions of the Missal and wipes the chalice with the purificator. Where a Deacon is present, he returns with the Priest to the altar and purifies the vessels. It is permissible, however, especially if there are several vessels to be purified, to leave them, covered as may be appropriate, on a corporal on the altar or on the credence table, and for them to be purified by the Priest or Deacon immediately after Mass once the people have been dismissed
According to the structure of each church building and in accordance with legitimate local customs, the Most Holy Sacrament is to be reserved in a tabernacle in a part of the church that is noble, prominent, readily visible, and adorned in a dignified manner” and furthermore “suitable for prayer” by reason of the quietness of the location, the space available in front of the tabernacle, and also the supply of benches or seats and kneelers.[221] In addition, diligent attention should be paid to all the prescriptions of the liturgical books and to the norm of law,[222] especially as regards the avoidance of the danger of profanation.[223]
Apart from the prescriptions of canon 934 § 1, it is forbidden to reserve the Blessed Sacrament in a place that is not subject in a secure way to the authority of the diocesan Bishop, or where there is a danger of profanation. Where such is the case, the diocesan Bishop should immediately revoke any permission for reservation of the Eucharist that may already have been granted.[224]
No one may carry the Most Holy Eucharist to his or her home, or to any other place contrary to the norm of law. It should also be borne in mind that removing or retaining the consecrated species for a sacrilegious purpose or casting them away are graviora delicta, the absolution of which is reserved to the Congregation for the Doctrine of the Faith.
The diocesan Bishop should acknowledge and foster insofar as possible the right of the various groups of Christ’s faithful to form guilds or associations for the carrying out of adoration, even almost continuous adoration. Whenever such associations assume an international character, it pertains to the Congregation for Divine Worship and the Discipline of the Sacraments to erect them and to approve their statutes