Sorry, but the possibility of legalism is very real. For example suppose you goto church on Saturday in "obedience to law", leaving at home an ultra-sick or ultra-elderly family member or relative to fend for themselves, thus allowing them to suffer miserably, possibly even die.
Legalism is prioritizing the letter of the law (the face-value meaning of the words) over the spirit of the law (the underlying meaning and real purpose of the law) - which is love. Whenever those two meanings diverge in real life scenarios, adherence to the letter is actually disobedience to the law, because it culminates in unloving behavior.
These instances are referenced in the Bible and that's why some accused Jesus of breaking the Sabbath to heal. If Jesus sinned there is no hope for any of us.
John 12 9-12
Healing on the Sabbath
9 Now when He had departed from there, He went into their synagogue. 10 And behold, there was a man who had a withered hand. And they asked Him, saying, “Is it lawful to heal on the Sabbath?”—that they might accuse Him.11 Then He said to them, “What man is there among you who has one sheep, and if it falls into a pit on the Sabbath, will not lay hold of it and lift
it out? 12 Of how much more value then is a man than a sheep? Therefore it is lawful to do good on the Sabbath.”
The Sabbath is the one Commandment that starts with "Remember" the only one that references "holy" and the only one God "blessed".
Exodus 20 8-11 8 “Remember the Sabbath day, to keep it holy. 9 Six days you shall labor and do all your work, 10 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. 11 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.
Why is it so important? This is the one commandment that strengthens your relationship with God.
I Never Knew You
Mathew 7
21 “Not everyone who says to Me, ‘Lord, Lord,’ shall enter the kingdom of heaven, but he who does the will of My Father in heaven. 22 Many will say to Me in that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?’ 23 And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness!’
The sabbath (4th commandment) is a day we are supposed to put aside all the stresses of the world and and build our relationship with Christ. We do this by worshipping Him in fellowship, Bible studies, praying, and doing good on His day, which includes helping the sick.