Śatapatha Brāhmaṇa ("of a hundred paths") 2.3.4.6

2.3.4.6

atha yasmānnopatiṣṭheta | yo vai brāhmaṇaṃ vā śaṃsamāno 'nucarati kṣatriyaṃ vāyam me dāsyatyayam me gṛhān kariṣyatīti yo vai taṃ vādyena vā karmaṇā vābhirirādhayiṣati tasmai vai sa deyam manyate 'tha ya āha kiṃ nu tvam mamāsi yo me na dadāsītīśvara enaṃ dveṣṭorīśvaro nirvedaṃ gantostasmānnopatiṣṭhetaitadittvevaiṣa eta yācate yadinddhe yajjuhoti tasmānnopatiṣṭheta

And again, why he should not approach (the fires). Whosoever follows either a Brâhman or Kshatriya, praising him, thinking, 'He will give me gifts, he will build me a house,' to him, if he strives to please him both in speech and deed, that (master of his) will think himself bound to give gifts. Whosoever, on the other hand, says, 'What art thou to me, that givest me nothing?' him that (master) is likely to hate, to become disgusted with. Hence one should not approach (the fire); for by kindling and offering in it, he already supplicates it, and he should not therefore approach (and importune it again).