For the Unity of the Church

From the Book of Divine Worship - The Proper: Third Part - Various Occasions.

Collect

I. Almighty Father, whose blessed Son before his passion prayed for his disciples that they might be one, even as thou and he are one: Grant that thy Church, being bound together in love and obedience to thee, may be united in one body by the one Spirit, that the world may believe in him whom thou didst send, the same thy Son Jesus Christ our Lord; who liveth and reigneth with thee, in the unity of the same Spirit, one God, now and for ever. Amen.

II. Almighty Father, whose blessed Son before his passion prayed for his disciples that they might be one, as you and he are one: Grant that your Church, being bound together in love and obedience to you, may be united in one body by the one Spirit, that the world may believe in him whom you have sent, your Son Jesus Christ our Lord; who lives and reigns with you, in the unity of the Holy Spirit, one God, now and for ever. Amen.

Prayer over the Gifts

Lord, by one perfect sacrifice you gained us as your people. Bless us and all your Church with gifts of unity and peace. We ask this in the name of Jesus the Lord. Amen.

Or this:

Lord, hear our prayer for your mercy, as we celebrate this memorial of our salvation. May this sacrament of your love be our sign of unity and our bond of charity. We ask this through Christ our Lord. Amen.

Or this:

Father, may the sacrifice we offer you free us from our sins and bring together all who are joined by one baptism, to share this mystery of the Eucharist. Grant this through Christ our Lord. Amen.

Preface 25 - Baptism or Preface 13 - Trinity Sunday.