Shatapatha Brahmana 9.5.2.16

9.5.2.16

sa hovāca | kiṃ nu lokyaṃ kimalokyamātmā vai yajñasya yajamāno 'ṅgānyṛtvijo yatra vā ātmā tadaṅgāni yatro aṅgāni tadātmā yadi vā ṛtvijo 'lokā bhavantyaloka u tarhi yajamāna ubhaye hi samānalokā bhavanti dakṣiṇāsu tveva na saṃvaditavyaṃ saṃvādenaiva 'rtvijo 'lokā iti

He said, 'What is conducive to heaven, and what is not conducive thereto? The Sacrificer is the body of the sacrifice, and the officiating priests are the limbs; and, surely, where the body is there are the limbs; and where the limbs are there is the body. And, verily, if the priests have no place in heaven, then the Sacrificer has none, for both are of the same world. But let there be no bargaining as to sacrificial fees, for by bargaining the priests are deprived of their place in heaven.'