From
The Didache, chapter 9.
1 But concerning the Eucharist, after this fashion give ye thanks.
2 First, concerning the cup. We thank thee, our Father, for the holy vine, David thy Son, which thou hast made known unto us through Jesus Christ thy Son; to thee be the glory for ever.
3 And concerning the broken bread. We thank thee, our Father, for the life and knowledge which thou hast made known unto us through Jesus thy Son; to thee be the glory for ever.
4 As this broken bread was once scattered on the mountains, and after it had been brought together became one, so may thy Church be gathered together from the ends of the earth unto thy kingdom; for thine is the glory, and the power, through Jesus Christ, for ever.
5 And let none eat or drink of your Eucharist but such as have been baptized into the name of the Lord, for of a truth the Lord hath said concerning this, Give not that which is holy unto dogs.