Śatapatha Brāhmaṇa ("of a hundred paths") 4.3.4.23

4.3.4.23

athāhendrāya marutvate 'nubrūhīti | yatra vai prajāpatiragre dadau taddhendra īkṣāṃ cakre sarvaṃ vā ayamidaṃ dāsyati nāsmabhyaṃ kiṃ cana pariśekṣyatīti sa etaṃ vajramudayacadindrāya marutvate 'nubrūhītyadānāya tato nādadātsa eṣo 'pyetarhi tathaiva vajra udyamyata indrāya marutvate 'nubrūhītyadānāya tato na dadāti

Thereupon he (the Adhvaryu) says (to the Maitrâvaruna), 'Recite (the invitatory prayer) to Indra, followed by the Maruts!' Now when, in the beginning, Pragâpati gave gifts, Indra thought within himself, 'Everything here, forsooth, he will give away, and not anything will he leave for us.' He then, to stop the giving, raised up that thunderbolt 'Recite to Indra Marutvat!' and thereafter he (Pragâpati) gave no more. And in like manner is that thunderbolt 'Recite to Indra Marutvat!' now raised up to stop the giving, and thereafter he (the sacrificer) gives no more.
24; There are, then, four (kinds of) sacrificial gifts: Gold--thereby indeed he preserves his own life, for gold is life. That he (Pragâpati or Varuna) gave to Agni, performing the office of the Agnîdh (fire-kindler): wherefore now also gold is given to the Agnîdh.