A  The Sabbath is God's appointed day of rest and worship. It was sanctified (set-apart for holy use) at creation because on the seventh day God rested from His work. (Genesis 2:3) (Exodus 20:11)

The observance of the Sabbath was enjoined in the Ten Commandments, and is a sign between God and His people. (Exodus 31:13)

The observance of the seventh day Sabbath was affirmed by the example of Jesus Christ and His Apostles. (Luke 4:16) (Acts 17:2)

Instead of abolishing Sabbath observance, Jesus carefully taught how it should be observed. (Matthew 12:1-13)

The Jewish religious establishment had added 65 specific do's and don'ts to Sabbath observance which God had not authorized, which made its observance a burden instead of a delight. Jesus explained that the Sabbath was made for man and not that man was made for the Sabbath. (Mark 2:27)

Sabbath observance was commanded before it was given as the fourth Commandment at Mt. Sinai. (Exodus 16:22-30)

Sabbath observance is not for the Israelite only, but for Gentiles who wish to enter into Covenant with God. (Isaiah 56:6-7)

The Apostle assembled and preached to even the Gentiles on the Sabbath. (Acts 13:42-44) The book of Acts alone gives record of him holding 84 meetings on the Sabbath. (Acts 13:14,44 / 16:13 / 17:2 / 18:4,11)

Jesus instructed Christians to pray that the time to flee persecution just prior the the Great Tribulation would not fall upon the Sabbath Day, showing that the Sabbath would still be holy at that time leading up to His second coming. (Matthew 24:20)

All mankind will observe the Sabbath when Christ returns and establishes the Kingdom of God on the earth. (Isaiah 66:23)

For Additional information: "The Seventh-Day Sabbath, in Scripture and History with Commentary"

Jesus is Lord. Blessed be His Name!