The hymn emphasizes the invocation of अग्नि , the purifier and invoker, to bring gods to the sacrificial offering [rv-1-13-1 ] rv • Book 1 . अग्नि , as तनूनपात् , is asked to present well-favoured sacrifices [rv-1-13-2 ] rv • Book 1 . नराशम्श is invoked for his sweet tongue [rv-1-13-3 ] rv • Book 1 . Sacred rites involve invoking the goddesses इऌआ , सरस्वती , मही , and the divine craftsman त्वष्टृ for divine presence and blessings [rv-1-13-10 ] rv • Book 1 [ [rv-1-13-9 ] rv • Book 1 ]