Q: What is Sacrament from the Reserve?
A: Sacrament from the Reserve is administration of communion by a deacon to a congregation when a priest is unavailable, using consecrated bread and wine. It is customary to keep the consecrated elements in a tabernacle or an aumbry or covered with a veil on a table or altar. A lamp or candle burns nearby to announce the presence of the reserved sacrament. This light is known as a sanctuary lamp if the reservation is near the altar.
Above is shown the tabernacle where we keep consecrated bread and wine, next to the sanctuary lamp. Both are on top of a credence table, which is a small table used in the celebration of the Eucharist.