Regarding the Sabbath. In the OT it was primarily a day for rest and family. (Hopefully in your employment you have a day or two off and get rested and time with your family). The New Covenant moved the
sabbath" from the 7th day to the 8th day, or first day, depending on how you are counting (Sunday; the 8th day being symbolic of Christian eternal rest with Christ) and put the emphasis on worship (liturgy) rather than rest from labor.
I've read and heard it this way by some, and by others that the 7th day (Saturday) is still
the Sabbath. I personally look to the great service of Holy Saturday which calls this Saturday the blessed Sabbath
on which Christ rested in the tomb. If Christ, by resting in the tomb, reiterated the holiness He granted to the Sabbath when He created the world, then how do we say that Saturday is no longer the Sabbath? I just see the 7th Day Sabbath within the light of the eschatological 8th Day, the Day of Resurrection that heralds our eternal Sabbath rest at the end of the age.