Acts 20

Luke records what I consider a significant verse that -

"...upon the first day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight."  (Acts 20:7)

I note that the "Christians" now considered the first day of the week or Sunday to be the Sabbath.  I also interpret then that as the disciple gathered on the Sabbath, that break bread suggested they were participating in the ordinance of the sacrament.