Agniveshyagrihyasutra 3.5.8.7

3.5.8.7

athaināmutsṛjati mātā rudrāṇāṃ duhitā vasūnāṃ svasātityānām amṛtasya nābhiḥ \

Then he releases her: "The mother of the Rudras, the daughter of the Vasus, the sister of the Ādityas, the navel of immortality;