Atharvaveda 5.2.9

5.2.9

evā́ mahā́n br̥háddivo átharvā́vocat svā́ṃ tanvàm índram evá |
svásārau mātaríbhvarī aripré hinvánti caine śávasā vardháyanti ca ||9||

So hath the great Brihaddiva Atharvan spoken of his own self (tanū́) [as of] Indra; the two blameless, mother-growing sisters—[men] both impel them with might (çávas) and increase them.