John 7:21

Jesus answered and said unto them, I did one work, and ye all marvel because thereof.

This reference to healing the man at Bethesda, eighteen months earlier, which, even by their judgment, was a single violation of the sabbath (though actually not so at all) was made by Jesus for the sake of contrasting that lone act of mercy performed on the sabbath with the continual and constant violation of the sabbath on the part of the Pharisees by circumcising on the sabbath.