The collects for today, the Feast of Saint Peter and Saint Paul the Apostles, from The Book of Common Prayer  (Canadian, 1962):
O almighty God, who by thy Son Jesus Christ didst give to thy Apostle Saint Peter many excellent gifts, and commandedst him earnestly to feed thy flock: Make, we beseech thee, all Bishops and Pastors diligently to preach thy holy Word, and the people obediently to follow the same, that they may receive the crown of everlasting glory; through Jesus Christ our Lord. Amen.
O God, who, through the preaching of the blessed Apostle Saint Paul, hast caused the light of the Gospel to shine throughout the world: Grant, we beseech thee, that we, having his manifold labours in remembrance, may show forth our thankfulness unto thee for the same, by following the holy doctrine which he taught; through Jesus Christ our Lord. Amen.
Artwork: Giotto di Bondone (and assistants), The Stefaneschi Triptych : (left) Crucifixion of St. Peter, (right) Beheading of St. Paul, 1330. Tempera on wood, Pinacoteca Vaticana, Rome.