And certain of the Pharisees said unto them, Why do ye that which is not lawful to do on the sabbath days?

But certain of the Pharisees said, Why do ye that which it is not lawful to do on the sabbath day?

And some of the Pharisees said to them: Why do you that which is not lawful on the sabbath days?

But some of the Pharisees said to them, Why do ye what is not lawful to do on the sabbath?

and certain of the Pharisees said to them, 'Why do ye that which is not lawful to do on the sabbaths?'

And some of the Pharisees asked, "Why are you doing what the Law forbids on the Sabbath?"

But some of the Pharisees said, Why do you do what it is not right to do on the Sabbath?

Then certain Pharisees said to them, "Why are you doing what is not lawful on the Sabbaths?"

"Why are you doing what it is not allowable to do on the Sabbath?" asked some of the Pharisees.

Which is not lawful - See on Matthew 12:2-8 (note).

And certain of the Pharisees said unto them,.... Unto the disciples. The Evangelists Matthew and Mark say, that they said this to Jesus: no doubt but they said it to both, first to one, and then to the other; probably last of all to Christ, who returned an answer to it:
why do ye that which is not lawful on the sabbath day? as to pluck ears of corn, and rub them, and eat them; See Gill on Matthew 12:2

Why do ye - St. Matthew and Mark represent the Pharisees as proposing the question to our Lord himself. It was afterward, probably, they proposed it to his disciples.