Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
In the early Church it was called also "eucharist," or giving of thanks (comp. Mt. 26:27), and generally by the Latin Church "mass," a name derived from the formula of dismission, Ite, missa est, i.e., "Go, it is discharged."
The account of the institution of this ordinance is given in Mt. 26:26-29, Mk. 14:22-25, Lk. 22:19, 20, and 1 Cor. 11:24-26. It is not mentioned by John.
It was designed,
The elements used to represent Christ's body and blood are bread and wine. The kind of bread, whether leavened or unleavened, is not specified. Christ used unleavened bread simply because it was at that moment on the paschal table. Wine, and no other liquid, is to be used (Mt. 26:26-29). Believers "feed" on Christ's body and blood,
This is a permanent ordinance in the Church of Christ, and is to be observed "till he come" again.