Again he entered the synagogue, and a man was there who had a withered hand. 2They watched him to see whether he would cure him on the sabbath, so that they might accuse him. 3And he said to the man who had the withered hand, “Come forward.” 4Then he said to them, “Is it lawful to do good or to do harm on the sabbath, to save life or to kill?” But they were silent. 5He looked around at them with anger; he was grieved at their hardness of heart and said to the man, “Stretch out your hand.” He stretched it out, and his hand was restored. 6The Pharisees went out and immediately conspired with the Herodians against him, how to destroy him. (Mark 3:1-6, NRSV)
Is it wrong to heal on the Sabbath?
If you see the law as black and white then yes. Healing is working and working is wrong on the Sabbath. But was the law made so we can follow rules or we know better how to love each other and God?
The Law should point us to love. Not to keep people in bondage.
Love freely as God freely loves you.