Śatapatha Brāhmaṇa ("of a hundred paths") 9.1.1.25

9.1.1.25

sa eṣa kṣatraṃ devaḥ | tasmā etasmai kṣatrāyaitā viśo 'mum purastāduddhāramudaharanyo 'sau prathamo 'nuvāko 'thāsmā etamupariṣṭāduddhāramudaharaṃstenainamaprīṇaṃstathaivāsmā ayametamupariṣṭāduddhāramuddharati tenainam prīṇāti tasmādapyeṣa ekadevatyo bhavati raudra evaitaṃ hyevaitenaprīṇāti

That god (Rudra) is the kshatra (ruling power; chieftainship or chief); and for that chief these peasants set apart this special fore-share, to wit, that first section (of formulas); and now he (the Sacrificer) sets apart for him that after-share, and thereby gratifies him; and hence this (section) also belongs to a single deity, to wit, to Rudra; for it is him he thereby gratifies.