At church, very often, after the prayer on the Eucharist bread and wine is said and I am waiting my turn to go to the rail, I read prayer #66 on page 834 of The Book of Common Prayer which reads,
"Be present, be present, O Jesus, our great High Priest, as you were present with your disciples, and be known to us in the breaking of bread; who live and reign with the Father and the Holy Spirit, now and for ever. Amen."
Today, I saw that between the title ("Before Receiving Communion") and the prayer, there is a note saying, "See also the Prayer of Humble Access on page 337." This is that prayer:
"We do not presume to come to this thy Table, O merciful Lord, trusting in our own righteousness, but in thy manifold and great mercies. We are not worthy so much as to gather up the crumbs under thy Table. But thou art the same Lord whose property is always to have mercy. Grant us therefore, gracious Lord, so to eat the flesh of thy dear Son Jesus Christ, and to drink his blood, that we may evermore dwell in him, and he in us. Amen."