Arizona seminarians recently helped the Diocese of Phoenix prepare the oils that will be consecrated during the Chrism Mass, a yearly celebration that typically occurs during Holy Week.

“A few #PhxSems stopped by the Diocesan Pastoral Center today to record a rosary for @radiofamily.rosary and help the Office of Worship prepare oils for the annual Chrism Mass,” the diocese posted on Facebook. “Please remember all our seminarians in your prayers and don't forget to pray for vocations.” 

During this Mass, the priest consecrates three oils: the Oil of the Sick, the Oil of the Catechumens, and the Chrism, according to the U.S. Conference of Catholic Bishops (USCCB). 

Each of the oils has a special purpose, Simply Catholic explains. 

The Oil of the Sick is used in the Sacrament of the Anointing of the Sick. During this sacrament, a priest lays hands on a sick or elderly person, prays for him, and anoints him with oil on his head and hands. 

The Oil of the Catechumens is used to anoint both children and adults before their baptism. 

Chrism oil is used to consecrate someone to God, such as during the Sacrament of Confirmation. 

Every year, bishops across the country celebrate a Chrism Mass, at which they consecrate enough of each of the three oils for every church in their diocese to use for the year. 

The week between Palm Sunday and Easter is known as Holy Week, Britannica says. This year, it starts April 10. During Holy Week, Catholics commemorate Judas' betrayal of Jesus, the institution of the Eucharist, Jesus' Passion and crucifixion, his burial, and his Resurrection.