Just like you often read of the prayers of the Apostles in their writings in the NT, so in the Didache (a Christian book from the NT era) you find some prayers of the saints of their time.
Here is a prayer that was often prayed after the Lord’s Supper. (Sorry for the old English translation, the other option is Greek or Latin)
We thank Thee, holy Father, for Thy holy name which Thou didst cause to tabernacle in our hearts, and for the knowledge and faith and immortality, which Thou madest known to us through Jesus Thy Servant; to Thee be the glory for ever.
Thou, Master almighty, didst create all things for Thy name’s sake; Thou gavest food and drink to men for enjoyment, that they might give thanks to Thee; but to us Thou didst freely give spiritual food and drink and life eternal through Thy Servant.
Before all things we thank Thee that Thou art mighty; to Thee be the glory for ever.
Remember, Lord, Thy Church, to deliver it from all evil and to make it perfect in Thy love, and gather it from the four winds, sanctified for Thy kingdom which Thou hast prepared for it; for Thine is the power and the glory for ever.
Let grace come, and let this world pass away.
Hosanna to the God of David!
If any one is holy, let him come; if any one is not so, let him repent.
Indeed, 2000 years later we still echo those same great realities! Maranatha, may the Lord come quickly!