At one time on the invitation day in a certain monastery in the Kosalan country, there was a threat from primitive tribes. The monks were unable to do the invitation ceremony by means of three statements. “I allow you to do the invitation ceremony by means of two statements.” The threat from primitive tribes increased. The monks were unable to do the invitation ceremony by means of two statements. “I allow you to do the invitation ceremony by means of one statement.” The threat from primitive tribes increased further. The monks were unable to do the invitation ceremony by means of one statement. “I allow you to do the invitation ceremony in groups according to the year of seniority.” On one occasion on the invitation day in a certain monastery, most of the night had been spent with people making offerings.