And how will they make thee their judge, since they have beside them the Tourât,
in which is the command of God? Then they will turn their back after that, and
these are not believers. 
 Verily We have revealed the Tourât; therein is
guidance and light. The prophets that submitted themselves to God judged thereby
those that were Jews; and the doctors and priests (did the same,) in
accordance with that which was confided to their charge of the book of God, and
they were witnesses thereof. Wherefore fear not man, but fear Me, and sell not
thou the signs of God for a small price. And he that doth not judge by that
which God hath revealed, verily they are the unbelievers.
  And We have written for them,verily life for life, and eye for eye, and
  nose for nose, and ear for ear, and tooth for tooth; and for wounding
  retaliation; and he that remitteth the same as alms it shall be an atonement
  unto him. And he that judgeth not by that which God hath sent down, they are
  the transgressors.
  And We caused Jesus, the Son of Mary, to follow in their footsteps,
  attesting the Scripture of the Tourât which preceded Him; and We gave Him the
  Gospel, wherein is guidance and light, which attests the Tourât that preceded
  it, and a direction and an admonition to the pious;
  that the people of the
  Gospel might judge according to that which God hath revealed therein, and he
  that doth not judge according to that which God hath revealed, verily they are
  the flagitious ones.