(According to the records such as "Saikyuki "), a person called 'omi' or 'kosai' that was chosen by kameura (tortoise-shell divination) in the process called senjiki (占食), served in Shinto festivals (anyone not chosen by the senjiki (占食), was called ohomi (大忌) ('oh"(大) means 'mediocrity'(凡)) and was not allowed to hold an important position in the festivals).
(『西宮記』ほか)これらの親祭では、占食といって亀占により選ばれた者が「小忌(小斎)」と呼ばれて神祭に奉仕した(これに選ばれない者は「大忌」－「大」は「凡」と同じで「一般の」の意味－と呼ばれ、祭の枢要に携わることはできなかった)。