A lot of people have opinions and have created their own doctrine around the Sabbath day, but what does the Bible say?
First, let's look at the 4th commandment given to Moses in Exodus 20:8-11.
"Remember the Sabbath day, to keep it holy. Six days you shall labor and do all your work, but the seventh day is the Sabbath of the Lord your God. In it you shall do no work: you, nor your son, nor your daughter, nor your male servant, nor your female servant, nor your cattle, nor your stranger who is within your gates. For in six days the Lord made the heavens and the earth, the sea, and all that is in them, and rested the seventh day. Therefore the Lord blessed the Sabbath day and hallowed it."
God commanded His people not to work on the Sabbath, but to keep it Holy. Now let's look at what Jesus said in Mark Chapter 2:23-28:
Now it happened that He went through the grainfields on the Sabbath; and as they went His disciples began to pluck the heads of grain. And the Pharisees said to Him, “Look, why do they do what is not lawful on the Sabbath?”
But He said to them, “Have you never read what David did when he was in need and hungry, he and those with him: how he went into the house of God in the days of Abiathar the high priest, and ate the showbread, which is not lawful to eat except for the priests, and also gave some to those who were with him?”
And He said to them, “The Sabbath was made for man, and not man for the Sabbath. Therefore the Son of Man is also Lord of the Sabbath.”
Jesus said He was Lord of the Sabbath and the Sabbath was created for us, not us for the Sabbath. The Sabbath serves us, we don't serve it.
Jesus says it's not unlawful to pluck grain on the Sabbath nor was it unlawful for David to eat the showbread when he was hungry. Jesus healed the man with the withered hand on the Sabbath and He told the lame man to pick up his bed and walk on the Sabbath. None of this was unlawful for Jesus to do on the Sabbath.
Jesus is Lord of the Sabbath. Jesus is perfect and incapable of sin. Therefore, it's not sinful to work on the Sabbath.