Both Tomokuyu were for purifying and preparing for the event in name, but virtually they were given to lords, their attendants, and their messengers, who came from far away, for providing them with things they needed to stay.
どちらも斎戒沐浴を名目とするが、遠くから来る諸侯と従者、使者の滞在に必要なものを、現地で満たすために与えられたのであろう。