Mbh 13.22.5

"'Yudhishthira said, "It has been said that a Brahmana that is sought to be employed in an act having reference to the deities, should never be examined. The learned, however, say that with respect to such acts as have reference to the Pitris, the Brahmana that is sought to be employed, should be examined (in the matter of both his conduct and competence)."