ṚV, 6, 36, 2.2 syūmagṛbhe dudhaye 'rvate ca kratuṃ vṛñjanty api vṛtrahatye //

ṚV, 10, 102, 6.2 dudher yuktasya dravataḥ sahānasa ṛcchanti ṣmā niṣpado mudgalānīm //