It is always lawful to do a good thing, any good thing, work or not, on the Sabbath day, or any other day of the week, was more Jesus point in the matter, etc, and it was not breaking the law, etc...
Mark 3:1-6- "And he entered again into the synagogue; and there was a man there which had a withered hand. And they watched him, whether he would heal him on the sabbath day; that they might accuse him. And he saith unto the man which had the withered hand, Stand forth. And he saith unto them, Is it lawful to do good on the sabbath days, or to do evil? to save life, or to kill? But they held their peace. And when he had looked round about on them with "anger", being "grieved for the hardness of their hearts", he saith unto the man, Stretch forth thine hand. And he stretched it out: and his hand was restored whole as the other. And the Pharisees went forth, and straightway took counsel with the Herodians against him, how they might destroy him."
Again, the "letter" of it versus the "Spirit" of it/them or behind them, etc...
Also like with what Jesus pointed out also about murder and adultery also, etc...
And how people deceive themselves with the letter of it/them, because sin starts in the heart with any and/or all of any of the commandments, etc...
And that, cannot be expressed or fully shown out in all it's details fully by the letter, etc...
The Pharisees could supposedly keep the letter of it/them, and think they were innocent and blameless, etc, but in all reality they 100% absolutely were not, and did not keep them because the 100% totally missed out on the Spirit of it/them, and their hearts were still uncircumcised, because they had not let the true law circumcise them yet, by allowing it to kill them, etc, their old man, old personality, etc, so they could come to Jesus and be born again of water and Spirit, etc, which was the OT law covenants true purpose, (see my earlier posts, etc), to make all become guilty before God so they could come to Jesus and be washed by Him and made clean and be truly born again, etc...
Beyond that the OT letter of the law covenant has no other purpose, etc, so some totally miss it, and miss out, and miss the point, etc... That it was to point out God righteousness against our own self-righteousness, etc, to the point to where we would admit our own (righteousness/self-righteousness) is "far far inferior", and never was really ever at all really true righteousness at all to ever begin with, etc, but only our extreme sinfulness and very bad and wicked and evil sinful nature, etc, that we would ever think our own righteousness, that would come by the OT law, would ever fully meet or exceed God's ever at all, etc, on our own, etc...
And the whole of it, the OT law covenant, when not seen correctly, would show our greatest number one sin of all, etc...
And would even make it even worse, or even much more exceedingly sinful, etc, like it did in time with people like the Pharisees by the time we get to the NT, etc...
Same sin of Satan the Devil BTW, which might be why Jesus said that one was their true father in their hearts maybe, etc...?
For he still, "still", even down to this very selfsame day, thinks he is better than others, and that he is more righteous, in his own self-righteousness, than God, etc, still think He is more right, or more superior still, etc, has a superior morality or moral code, and he just won't let it go fully yet still, etc, "even yet still", etc...
Anyway, so I hope by now you see the OT law's true purpose by now, etc...
And if not I might say more "maybe", or "maybe" I might not...
Anyway,
God Bless!