B1C1V7:

After reaching the house of YAMA, Nachiketa had to waiting for YAMA for three days, because YAMA was not present. While waiting he declined all request for food & drinks, because he did not know how the owner of the house would accept him. The inmates of the house of YAMA could understand that the kid was in search for the absolute truth and so he was most adorable and respectable person to them. That is why, when YAMA came, the inmates of his house told him to extend a gesture of hospitality and respect to the guest. A seeker of truth deserved to be treated most respectfully. He is like fire, so to calm him down one should extend his respect and hospitality to him just as one calms down the fire with water.