Answer: "O People of the Scripture, you are [standing] on nothing until you uphold [the law of] the Torah, the Gospel, and what has been revealed to you from your Lord."
Reference:
O Messenger, announce that which has been revealed to you from your Lord, and if you do not, then you have not conveyed His message. And Allah will protect you from the people. Indeed, Allah does not guide the disbelieving people.
Say, "O People of the Scripture, you are [standing] on nothing until you uphold [the law of] the Torah, the Gospel, and what has been revealed to you from your Lord." And that which has been revealed to you from your Lord will surely increase many of them in transgression and disbelief. So do not grieve over the disbelieving people.
Indeed, those who have believed [in Prophet Muhammad] and those [before Him] who were Jews or Sabeans or Christians - those [among them] who believed in Allah and the Last Day and did righteousness - no fear will there be concerning them, nor will they grieve.
