a prayer

this is from Advent, I guess from the Book of Common Prayer, but I'm not really sure.

Most merciful Lord,
your love compels us to come in.
Our hands were unclean,
our hearts were unprepared;
we were not fit
even to eat the crumbs from under your table.
but you, Lord, are the God of our salvation,
and share your bread with sinners.
So cleanse and feed us
with the precious body and blood of your Son,
that he may live in us and we in him;
and that we, with the whole company of Christ,
may sit and eat in your kingdom. Amen.

Behold the Lamb of God; behold him that takes away the sins of the world.

Lord, I am not worthy that you should come under my roof; but speak the word only, and my soul shall be healed.