The book of Revelations reveals the heavenly Liturgy, that mirrors the Liturgy (Mass) God ordained and fixed here on earth. In short, the heavenly eternal Liturgy is outside of time and space, where the Lamb is standing looking as though slain in the presence of the Martyr’s, Saints, Virgin Priest and Angels. The heavenly Liturgy while in the Presence of God offers up our prayers and incense to God our Father.
God’s liturgy (Mass) on earth enter’s into the Heavenly Holy of Holies. It is here in the Liturgy where the Church Triumphant (in heaven) offers up all our prayers and where the Church Militant (on earth) joins the Heavenly Choir when we worship and offer up our prayers and Pslams.
Hebrews gives a brief description here.
Hebrews 12; 1 Therefore, since we are surrounded by so great a cloud of witnesses, let us rid ourselves of every burden and sin that clings to us and persevere in running the race that lies before us 2 while keeping our eyes fixed on Jesus, the leader and perfecter of faith.
18 You have not approached that which could be touched and a blazing fire and gloomy darkness and storm 19 and a trumpet blast and a voice speaking words such that those who heard begged that no message be further addressed to them, 20 for they could not bear to hear the command: “If even an animal touches the mountain, it shall be stoned. so fearful was the spectacle that Moses said, “I am terrified and trembling.”22 No, you have approached Mount Zion and the city of the living God, the heavenly Jerusalem, and countless angels in festal gathering,23 and the assembly of the firstborn enrolled in heaven,[*] and God the judge of all, and the spirits of the just made perfect, 24 and Jesus, the mediator of a new covenant, and the sprinkled blood that speaks more eloquently than that of Abel.
25 See that you do not reject the one who speaks. For if they did not escape when they refused the one who warned them on earth, how much more in our case if we turn away from the one who warns from heaven.