अथ हैनं प्रस्तोतोपससाद प्रस्तोतर्या देवता प्रस्तावमन्वायत्ता तां चेदविद्वान्प्रस्तोष्यसि मूर्धा ते विपतिष्यतीति मा भगवानवोचत्कतमा सा देवतेति ॥ १.११.४ ॥
In plain words
Then the Prastotṛ came to him and said, "Sir, thou saidst to me, 'Prastotṛ, if thou singest the Prastāva without knowing the deity that belongs to it, thy head shall fall off.' Which is that deity?"