Śatapatha Brāhmaṇa ("of a hundred paths") 4.1.2.18

4.1.2.18

sa yadyupāṃśuṃ sādayet | athainaṃ sādayedyadyupāṃśuṃ na sādayennainaṃ sādayedyadyupāṃśumapidadhyādapyenaṃ dadhyādyadyupāṃśu nāpidadhyānnainamapidadhyādyathopāṃśoḥ karma tathaitasya samānaṃ hyetadyadupāṃśvantaryāmau prāṇodānau hi

If he deposits the Upâmsu, let him also deposit this (Antaryâma cup); and if he does not deposit the Upâmsu, let him also not deposit this. And if he covers the Upâmsu (with his hand), let him also cover this; and if he does not cover the Upâmsu, let him also not cover this: as the performance regarding the Upâmsu, so regarding this (graha); for one and the same are these two, the Upâmsu and Antaryâma, since they are the out-breathing and in-breathing.