The Torah mentions that one should refrain from doing any melachah (work) on the day of Shabbat. The word melachah refers to any creative activity and is not limited to difficult physical activity. By relinquishing all constructive, creative work on Shabbat, we acknowledge that G-d is the true and ultimate Master of the world, and we humans have limited creative abilities. 

The only two forbidden acts that the Torah specifies are kindling a fire (which means no electricity or cooking on Shabbat) and carrying in the public domain. Our Sages have explained that melachah refers to any activity that replicates or resembles the work that was done in preparation for building the Mishkan (the temporary Sanctuary) in the desert. Altogether, this makes up the 39 melachas (categories of forbidden acts on Shabbat).

The 39 melachas are grouped into different categories for the different activities that the Jews engaged in preparation for building the Mishkan. The first group of 11 melachas is based on the process of making bread, from plowing and sowing the land to kneading and baking. The next 13 melachas are the method of producing garments, from shearing and dying the wool to tearing thread. The third set of melachas is based on the process of using parchment to write, from trapping an animal to writing and erasing. The final set of melachas involves other creative activities such as building and destroying, burning and extinguishing, finishing a product and transporting objects in the public domain.

Source: https://ezrasnashim.org/what-are-the-laws-of-shabbat/

The Sabbath boundaries are sundown Friday to sundown Saturday. What we must respect is that these are Jewish laws and only apply to Jews. No one else is bound by them.

When a married relative came to visit we invited them to lunch. Her husband declined because it was Sunday and his justification was that Sunday was the Sabbath and dining out would cause others to break Sabbath Law.

This is just one example how religious institutions can and do misapply Torah laws in an effort to control their congregations in what I call legalism. Misapplying God’s word to manipulate and control others is not righteous.

John 4:23 But the hour is coming, and is now here, when the true worshipers will worship the Father in spirit and truth, for the Father is seeking such people to worship him.

That hour came after sundown Sunday when Jesus returned after three days according to His promise. He was crucified Friday before sundown. By Jewish tradition Sunday after sundown was the third day. By Jewish traditions is the point.

As I look at John 4:23 I do not see boundaries. There are no restrictions about when and how to worship God in spirit and truth. Those two are good for all seasons, times and places, with no limits or restrictions applied.

If God changed the rules, why would we allow anyone to impose restrictions on us?

Matthew 12:1-2 English Standard Version

Jesus Is Lord of the Sabbath

1 At that time Jesus went through the grainfields on the Sabbath. His disciples were hungry, and they began to pluck heads of grain and to eat. 2 But when the Pharisees saw it, they said to him, “Look, your disciples are doing what is not lawful to do on the Sabbath.”

Matthew kept to the script of what happened that day. His scriptures serve a purpose. I ask myself if I understand exactly what law was broken.

Deuteronomy 23:25 If you go into your neighbor’s standing grain, you may pluck the ears with your hand, but you shall not put a sickle to your neighbor’s standing grain.

Eating when hungry is not work. Using a sickle would be considered work. Neither does Deuteronomy 23:25 call it theft or trespassing. So what law was broken?

While studying Matthew 12 extract literal intent, Jesus is the Lord of the Sabbath, I suggest that we are more likely to make the same mistakes that the Pharisees made in Matthew 12:2. 

• Romans 7:7 What then shall we say? That the law is sin? By no means! Yet if it had not been for the law, I would not have known sin. For I would not have known what it is to covet if the law had not said, “You shall not covet.”
  Romans 9:14 What shall we say then? Is there injustice on God’s part? By no means!

God was just in creating the law. Man has been unjust in its application and interpretation. It is not enough to say the law does not apply to us because we have grace from God.

I have said before, knowing a speed trap was ahead, I reduced my speed to the legal limit. When I did, God said to me “Is this how you eat my grace?”

Yes, I was convicted of my attitude. I had not been caught breaking the law by man but that cannot be our standard for living by faith. I try not to intentionally violate the speed limit. That is not to say I have always kept my eye on the needle. And yes, I urged my wife to run the red light while I was having a heart attack. So I justify my actions from time to time.

So the teachable moment here is that the intention of the heart is what God looks for in us.

The law is just but does not have a handle to be used as a weapon.