He is Shruti. He is the scriptures. He is Sacrificial vessels. He is the sixteen sacrificial priests. He is all the Sacrifices. He is the Grandfather (Brahman), He is Vishnu. He is the two Ashvins, and he is Purandara.
श्रुतिशास्त्रग्रहोपेतः षोडशविक् क्रतुश्च सः। पितामहश्च विष्णुश्च सोऽश्विनौ स पुरंदरः।