Book of Common Prayer (page 212)

Third Sunday of Advent

Stir up your power, O Lord, and with great might come
among us; and, because we are sorely hindered by our sins,
let your bountiful grace and mercy speedily help and deliver
us; through Jesus Christ our Lord, to whom, with you and
the Holy Spirit, be honor and glory, now and for ever. Amen.

Preface of Advent

Wednesday, Friday, and Saturday of this week are the traditional winter
Ember Days.

Fourth Sunday of Advent

Purify our conscience, Almighty God, by your daily visitation,
that your Son Jesus Christ, at his coming, may find in us a
mansion prepared for himself; who lives and reigns with you,
in the unity of the Holy Spirit, one God, now and for ever.
Amen.

Preface of Advent

The Nativity of Our Lord: Christmas Day December 25

O God, you make us glad by the yearly festival of the birth
of your only Son Jesus Christ: Grant that we, who joyfully
receive him as our Redeemer, may with sure confidence
behold him when he comes to be our Judge; who lives and
reigns with you and the Holy Spirit, one God, now and
for ever. Amen.

or this

O God, you have caused this holy night to shine with the
brightness of the true Light: Grant that we, who have known
the mystery of that Light on earth, may also enjoy him
perfectly in heaven; where with you and the Holy Spirit he
lives and reigns, one God, in glory everlasting. Amen.