Institutio generalis Missalis Romani

In accordance with the structure of each church and legitimate local customs, the Most Blessed Sacrament should be reserved in a tabernacle in a part of the church that is truly noble, prominent, readily visible, beautifully decorated, and suitable for prayer.^{125Cf. Sacred Congregation of Rites, Instruction Eucharisticum mysterium, On the worship of the Eucharist, 25 May 1967, no. 54: AAS 59 (1967), p. 568; cf. also Sacred Congregation of Rites, Instruction Inter Oecumenici, On the orderly carrying out of the Constitution on the Sacred Liturgy, 26 September 1964, no. 95: AAS 56 (1964), p. 898.} The one tabernacle should be immovable, be made of solid and inviolable material that is not transparent, and be locked in such a way that the danger of profanation is prevented to the greatest extent possible.^{126Cf. Sacred Congregation of Rites, Instruction Eucharisticum mysterium, On the worship of the Eucharist, 25 May 1967. no. 52: AAS 59 (1967), p. 568; Sacred Congregation of Rites, Instruction Inter Oecumenici, On the orderly carrying out of the Constitution on the Sacred Liturgy, 26 September 1964, no. 95: AAS 56 (1964), p. 898; Sacred Congregation for the Sacraments, Instruction Nullo umquam tempore, 28 May 1938, no. 4: AAS 30 (1938), pp. 199-200; The Roman Ritual, Holy Communion and Worship of the Eucharist outside Mass, editio typica, 1973, nos. 10-11; Codex Iuris Canonici, can. 938  3.} Moreover, it is appropriate that, before it is put into liturgical use, it be blessed according to the rite described in the Roman Ritual.^{127Cf. The Roman Ritual, Book of Blessings, editio typica, 1984, Order for a Blessing on the Occasion of the Installation of a New Tabernacle, nos. 919-929.}

It is more in keeping with the meaning of the sign that the tabernacle in which the Most Holy Eucharist is reserved not be on an altar on which Mass is celebrated.^{128Cf. Sacred Congregation of Rites, Instruction Eucharisticum mysterium, On the worship of the Eucharist, 25 May 1967. no. 55: AAS 59 (1967), p. 569.} Consequently, it is preferable that the tabernacle be located, according to the judgment of the diocesan Bishop, Either in the sanctuary, apart from the altar of celebration, in a form and place more appropriate, not excluding on an old altar no longer used for celebration (cf. no. 303); Or even in some chapel suitable for the faithful’s private adoration and prayer^{129Cf. Sacred Congregation of Rites, Instruction Eucharisticum mysterium, On the worship of the Eucharist, 25 May 1967. no. 53: AAS 59 (1967), p. 568; The Roman Ritual, Holy Communion and Worship of the Eucharist outside Mass, edition typica, 1973, no. 9; Codex Iuris Canonici, can. 938 §2; John Paul II, Apostolic Letter Dominicae Cenae, 24 February 1980, no. 3: AAS 72 (1980), pp. 117-119.} and organically connected to the church and readily visible to the Christian faithful.

In accordance with traditional custom, near the tabernacle a special lamp, fueled by oil or wax, should be kept alight to indicate and honor the presence of Christ.^{130Cf. Codex Iuris Canonici, can. 940; Sacred Congregation of Rites, Instruction Eucharisticum mysterium, On the worship of the Eucharist, 25 May 1967. no. 57: AAS 59 (1967), p. 569; The Roman Ritual, Holy Communion and Worship of the Eucharist outside Mass, edition typica, 1973, no. 11.}

In no way should all the other things prescribed by law concerning the reservation of the Most Holy Eucharist be forgotten.^{131Cf. particularly in Sacred Congregation for the Sacraments, Instruction Nullo umquam tempore, 28 May 1938: AAS 30 (1938), pp. 198-207; Codex Iuris Canonici, cann. 934-944.}