Śatapatha Brāhmaṇa ("of a hundred paths") 3.8.3.35

3.8.3.35

atha yadvasāhomasya pariśiṣyate | tena diśo vyāghārayati diśaḥ pradiśa ādiśo vidiśa uddiśo digbhyaḥ svāheti raso vai vasāhomaḥ sarvāsvevaitaddikṣu rasaṃ dadhāti tasmādayaṃ diśi-diśi raso 'bhigamyate

With what is left of the offering of gravy, he then sprinkles the quarters, with, 'The regions,--the fore-regions,--the by-regions,--the intermediate regions,--the upper regions,--to the regions, Hail!' For the offering of gravy is sap: thus he imbues all the regions with sap, and hence sap is obtained here on earth in every region.