offertory -
The part of a church service when offerings are collected.
offertory -
music sung or played during the offertory of a church service.
Wikipedia
The Offertory is the portion a Eucharistic service when bread and wine are brought to the altar for consecration into the Body and Blood of Christ by the presiding priest or bishop. The offertory exists in Roman Catholic Celebrations of Mass, as well as Orthodox and Eastern Catholic celebrations of the Divine Liturgy. Anglican Masses, Lutheran Divine Services, and many other Protestant services offering Holy Communion have similar offertory rites, though the Eucharist theology varies among celebrations conducted by these denominations.