Śatapatha Brāhmaṇa ("of a hundred paths") 3.3.2.7

3.3.2.7

so 'bhimṛśati | āsmāko 'sīti sva iva hyasyaitadbhavati yadāgatastasmādāhāsmāko 'sīti śukraste grahya iti śukraṃ hyasmādgrahaṃ grahīṣyanbhavati vicitastvā vicinvantviti sarvatvāyaitadāha

He touches (the Soma-plants), with, 'Ours thou art,'--thereby he (Soma), now that he has come (as a guest), becomes as it were one of his (the sacrificer's) own (people): for this reason he says, 'Ours thou art;'--'Thy pure (juice) is meet for the draught,' for he will indeed take therefrom the 'pure draught.' 'Let the pickers pick thee!' this he says for the sake of completeness.