The Outline of the Mass comes from the Book of Revelation - you really can’t separate the Saints and the Angels from the mass because it is where Heaven and Earth meet.
Rev. 1:6, 20:6 - heaven’s identification of the priesthood of the faithful is the same as the Church’s identification on earth.
Rev. 1:10 - John witnesses the heavenly liturgy on Sunday, the Lord’s day, which is a Catholic holy day of obligation for attending Mass on earth.
Rev. 1:12, 2:5 - there are lampstands or Menorahs in heaven. These have always been used in the Holy Mass of the Church on earth.
Rev. 1:13 - Jesus is clothed as High Priest. Our priests also clothe themselves as “alter Christuses” (other Christs) in offering His sacrifice in the Holy Mass on earth.
Rev. 1:13, 4:4, 6:11, 7:9, 15:6, 19:13-14 - priests wear special vestments in heaven. Our priests also wear special vestments in celebrating the Holy Mass on earth.
Rev. 2:5,16,21; 3:3; 16:11 - there is a penitential rite in heaven which is also part of the liturgy of the Holy Mass on earth.
Rev. 2:17 - there is manna in heaven given to the faithful. This is the same as the Eucharistic manna given to the faithful at the Holy Mass on earth.
Rev. 4:4, 5:14; 11:16, 14:3, 19:4 - there are priests (“presbyteroi”) in heaven. Priests offer sacrifice. Our earthly priests participate with the heavenly priests in offering Jesus’ eternal sacrifice in the Holy Mass on earth.
Rev. 4:8 - heaven’s liturgical chant “Holy, Holy, Holy” is the same that is used in the liturgy of the Holy Mass on earth.
Rev. 4:8-11, 5:9-14, 7:10-12, 18:1-8 - the various antiphonal chants in the heavenly liturgy are similar to those used at the Holy Mass on earth.
Rev. 5:1 - there is a book or scroll of God’s word in heaven. This is reflected in the Liturgy of the Word at the Holy Mass on earth.
Rev. 5:6 and throughout - heaven’s description of Jesus as the “Lamb” is the same as the description of Jesus as the Lamb of God in the Eucharistic liturgy of the Holy Mass on earth.
Rev. 5:8, 6:9-11, 8:3-4 - heaven’s emphasis on the intercession of the saints is the same as the Holy Mass on earth.
Rev. 5:8, 8:3-4 - there is incense in heaven which has always been part of the liturgy of the Holy Mass on earth.
Rev. 5:14; 7:12; 19:4 - heaven’s concluding liturgical prayer “Amen” is the same as is used at the Holy Mass on earth.
Rev. 6:9 - the martyrs who are seen under the heavenly altar is similar to the Church’s tradition of keeping relics of saints under the earthly altars.
Rev. 7:3, 14:1, 22:4 - there is the sign of the cross (“tau”) in heaven. This sign is used during the Holy Mass on earth.
Rev. 7:9; 14:6 - the catholicity or universality of heaven as God’s family is the essence of the Catholic faith on earth.
Rev. 8:1 - the silent contemplation in heaven is similar to our silent contemplation at the Holy Mass on earth.
Rev. 8:3, 11:1, 14:18, 16:7 - there is an altar in heaven. But no altar is needed unless a sacrifice is being offered in heaven. This is the same sacrifice that is offered on the altars used in the Holy Masses on earth.
Rev. 11:12 - the phrase “come up here” is similar to the priest’s charge to “lift up your hearts” at the Holy Mass on earth.
Rev. 12:1-6, 13-17 - heaven’s emphasis on the Blessed Virgin Mary is the same as the Holy Mass on earth.
Rev. 12:7 - heaven’s emphasis on the Archangel Michael’s intercession is the same as the concluding prayers at the Holy Mass on earth.
Rev. 14:4 - there are consecrated celibates in heaven, as there are with our Catholic priests and religious on earth.
Rev. 15:7, 16:1-4,8,10,12,17; 21:9 - there are chalices (or bowls) in the heavenly liturgy. This is like the chalices used to offer Christ’s sacrifice in the Holy Mass on earth.
Rev. 15:3-4 - there is the recitation of the “Gloria” in heaven. This is also recited at the Holy Mass on earth.
Rev. 15:5 - there is a tent or tabernacle in heaven. Tabernacles are used to store the Eucharist at the Holy Mass on earth.
Rev. 17, 19:9 - the consummation of the Lamb at heaven’s marriage supper is the same as the Lamb’s supper in the Holy Mass on earth.
Rev. 19:1,3,4,6 - there is the recitation of the “Alleluia” in heaven. This is also recited at the Holy Mass on earth.
