Śatapatha Brāhmaṇa ("of a hundred paths") 5.4.5.4

5.4.5.4

tadāhuḥ | daśa pitāmahāntsomapāntsakhyāya prasarpettatho hāsya somapīthamaśnute daśapeyo hīti tadvai jyā dvau trīnityeva pitāmahāntsomapānvindanti tasmādetā eva devatāḥ saṃkhyāya prasarpet

Here now they say,--'Let him steal forth after enumerating ten Soma-drinking grandfathers: it is thus that he obtains for himself the Soma-draught of this (Dasapeya), for it is a "drinking of ten."' But that is an overburdening, for people (will be able to) obtain only two or three Soma-drinking grandfathers: hence let him steal forth after enumerating those same deities.