Śatapatha Brāhmaṇa ("of a hundred paths") 7.4.1.30

7.4.1.30

ye vāmī rocane divo | ye vā sūryasya raśmiṣu yeṣāmapsu sadaskṛtaṃ tebhyaḥ sarpebhyo nama iti yatra yatraite tadevaibhya etannamaskaroti namo nama iti yajño vai namo yajñenaivainānetannamaskāreṇa namasyati tasmādu ha nāyajñiya brūyānnamasta iti yathā hainam brūyādyajñasta iti tādṛktat

'Or those that are in the luminous sphere of the sky; or those in the rays of the sun; those by which abode is made in the waters, to those serpents be homage!' he hereby does homage to them wheresoever they are. He does so by 'homage, homage,' for homage is sacrifice (worship): by sacrifice, by homage, he thus worships them. Let him therefore not say 'homage be to thee,' to one not worthy of sacrifice, for it would be just as if he said 'sacrifice (or, worship) be to thee!'