四分律比丘含注戒本 2.281

2.281

The Buddha, wandering among human realms from Rājagṛha, arrived in the country of Anāpiṇḍa. Because Śāṇu offered gruel, he permitted eating gruel. Because of eating thick gruel, and because at festive gatherings donors sent food, he further received subsequent invitations. The laity mocked and the religious criticized; the Buddha therefore laid down the rule.