Dadhikras , the Rbhus , Dyaus and Prthivi (Heaven and Earth), Parjanya (Rain) and Indra- Soma . 7.103 is dedicated to the frogs . The rivers mentioned in the 7th Mandala are the Sarasvati , Asikni , Parusni and possibly the Yamuna (in 7.18.19 the name of a helper of Indra,