Christian worship
The very early development of Christian worship is lost in history, but Christian worship is, normally, fixed in the worship of Judaism.  The Gospels and the Acts of the Apostles present the very early Christians as visiting both the Temple and synagogues, as well as worshipping in private homes, frequently to "break bread," a term which signifies both the sharing of a meal and, when used in that context, celebrating the Eucharist.  Acts 2:42 shows the very early Church of Jerusalem as "continuing in the Apostles' teaching and fellowship [or communion], the breaking of bread, and the prayers."