The Supreme Court on Wednesday cautioned NGO Common Cause against making unsubstantiated allegations against constitutional functionaries, including Prime Minister Narendra Modi, and observed that it would not order an inquiry on the basis of Income Tax papers relating to raids at Aditya Birla Group and Sahara companies unless there was credible material to suggest illegal payoffs to politicians. "This is becoming very abnormal for us. What we told you (petitioner)… give us smallest material. We will deal with it… How will a constitutional authority function if you are going to make such allegations? We don't see even the smallest material to substantiate your accusations," a bench of Justices J S Khehar and Arun Mishra told advocate Prashant Bhushan, appearing for NGO Common Cause. Earlier in November, the court had said that documents adduced by NGO 'Common Cause' were neither authentic nor credible enough for an inquiry to be launched into the veracity of the entries on payments allegedly made to various politicians.