213. With the clear and sober language of catechesis, the Church teaches that "the existence of the spiritual, non-corporeal beings that Sacred Scripture usually calls 'angels' is a truth of faith. The witness of Scripture is as clear as the unanimity of Tradition"(280).
Tradition regards the angels as messengers of God, "potent executives of his commands, and ready at the sound of his words" (Ps 103, 20. They serve his salvific plan, and are "sent to serve those who will inherit salvation" (Hb 1, 14).
214. The faithful are well aware of the numerous interventions of angels in the New and Old Covenants. They closed the gates of the earthly paradise (cf. Gen 3,24), they saved Hagar and her child Ishmael (cf. Gen 21, 17), they stayed the hand of Abraham as he was about to sacrifice Isaac (cf. gen 22, 7), they announce prodigious births (cf. Jud 13, 3-7), they protect the footsteps of the just (cf. Ps 91, 11), they praise God unceasingly (cf. Is 6, 1-4), and they present the prayer of the Saints to God (cf. Ap 8, 34). The faithful are also aware of the angel's coming to help Elijah, an exhausted fugitive (cf. 1 Kings 19, 4-8), of Azariah and his companions in the fiery furnace (cf. Dan 3, 49-50), and are familiar with the story of Tobias in which Raphael, "one of the seven Angels who stand ever ready to enter the presence of the glory of God" (cf. Tb 12, 15), who renders many services to Tobit, his son Tobias and his wife Sarah.
The faithful are also conscious of the roles played by the Angels in the life of Jesus: the Angel Gabriel declared to Mary that she would conceive and give birth to the Son of the Most High (cf. Lk 1, 26-38), and that an Angel revealed to Joseph the supernatural origin of Mary's conception (cf. Mt 1, 18-25); the Angels appear to the shepherds in Bethlehem with the news of great joy of the Saviour's birth (cf. Lk 2, 8-24); "the Angel of the Lord" protected the infant Jesus when he was threatened by Herod (cf. Mt 2, 13-20); the Angels ministered to Jesus in the desert (cf. Mt 4, 11) and comforted him in his agony (Lk 22, 43), and to the women gathered at the tomb, they announced that he had risen (cf. Mk 16, 1-8), they appear again at the Ascension, revealing its meaning to the disciples and announcing that "Jesus ...will come back in the same way as you have seen him go" (Acts 1, 11).
The faithful will have well grasped the significance of Jesus' admonition not to despise the least of those who believe in him for "their Angels in heaven are continually in the presence of my Father in heaven" (Mt 10, 10), and the consolation of his assurance that "there is rejoicing among the Angels of God over one repentant sinner" (Lk 15, 10). The faithful also realize that "the Son of man will come in his glory with all his Angels" (mt 25, 31) to judge the living and the dead, and bring history to a close.
215. The Church, which at its outset was saved and protected by the ministry of Angels, and which constantly experiences their "mysterious and powerful assistance"(281), venerates these heavenly spirits and has recourse to their prompt intercession.
During the liturgical year, the Church celebrates the role played by the Holy Angels, in the events of salvation(282) and commemorates them on specific days: 29 September (feast of the Archangels Michael, Gabriel and Raphael), 2 October (the Guardian Angels). The Church has a votive Mass dedicated to the Holy Angels whose preface proclaims that "the glory of God is reflected in his Angels"(283). In the celebration of the sacred mysteries, the Church associates herself with the angelic hymn and proclaims the thrice holy God (cf. Isaiah 6, 3)(284) invoking their assistance so that the Eucharistic sacrifice "may be taken [to your] altar in heaven, in the presence of [...] divine majesty"(285). The office of lauds is celebrated in their presence (cf. Ps 137, 1)(286). The Church entrusts to the ministry of the Holy Angels (cf. Aps 5, 8; 8, 3) the prayers of the faithful, the contrition of penitents(287), and the protection of the innocent from the assaults of the Malign One(288). The Church implores God to send his Angels at the end of the day to protect the faithful as they sleep(289), prays that the celestial spirits come to the assistance of the faithful in their last agony(290), and in the rite of obsequies, invokes God to send his Angels to accompany the souls of just into paradise(291) and to watch over their graves.CONGREGATION FOR DIVINE WORSHIP AND THE DISCIPLINE OF THE SACRAMENTS Directory on Popular Piety and Liturgy 213-215