Answers
Which day is the Sabbath, and must I keep it?
The fourth commandment sets apart a seventh day for rest and worship. From the earliest records, most Christians gathered on the first day of the week because that is the day Christ rose, and called it the Lord's day; Seventh-day Adventists and others hold that the seventh-day Sabbath was never transferred. Paul addresses the dispute directly and tells believers not to judge each other over days, while the principle of a weekly rest is not a burden to escape but a gift most of us are refusing.
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Remember the sabbath day, to keep it holy.
Exodus 20:8
And he said unto them, The sabbath was made for man, and not man for the sabbath:
Mark 2:27
One man esteemeth one day above another: another esteemeth every day alike. Let every man be fully persuaded in his own mind.
Romans 14:5
Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
Colossians 2:16