The vow of fast had been known to Indra. He had, however, kept it a secret. Shukra, the descendent of Bhrigu, gained a knowledge of it by means of spiritual sight acquired through penances. Burning with energy as he does, it is Ushanas who first made it known to the universe. I observed that vow, O boongiving Deity.
इन्द्रेण गुह्यं निहितं वै गुहायां यद्भार्गवस्तपसेहाभ्यविन्दत्। जाज्वल्यमानमुशनस्तेजसेह तत्साधयामासमहं वरेण्य॥