John 2:5

5. Mother saith unto the servants However obscure to commentators, the words of Jesus were clear to Mary. She understands, first, that she is properly excluded from all control over her son’s miraculous functions; second, that it is by miracle that he assumes that he is requested by her to supply the deficit of wine; and, third, (probably from his significant word yet,) that the miracle may still be performed. That rests supremely with her son and Lord.

Whatsoever he saith These words perfectly surrender the matter to him, with blended submission and faith; which probably hastened the arrival, or at least fulness of the HOUR, and completed the possibility of the miracle.

Do it She speaks as having authority here; and she speaks to subordinate that authority to him.