Shatapatha Brahmana 4.4.3.10

4.4.3.10

taddhaike | hotre droṇakalaśam pratiparāharanti vaṣaṭkarturbhakṣa iti vadantastadu tathā na kuryādyathācamasa vā anye bhakṣā athaiṣo 'tiriktastasmādetasmintsarveṣāmeva bhakṣastasmāddhānā vilipsante bhakṣāya

Now some take the Dronakalasa over to the Hotri, on the ground that 'the draught belongs to the utterer of the Vashat.' But let him not do it thus; for the other draughts are (taken by the respective priests) according to the kamasa cups, but this one is in excess: therefore there is a draught in it for all of them,--for this reason they divide the grain between them for the sake of the Soma-draught.