佛說目連問戒律中五百輕重事經 2.137

2.137

問：「若還，還云何？」「向本師、若一比丘言：『我從今日已後，不復能歸佛法歸比丘僧。』如是三說。若不滿三，故成就三歸。」

Question: "If one returns them, how does one return them?" [Answer:] "One states to one's original master or to a bhikṣu: 'From this day forward, I can no longer take refuge in the Buddha, take refuge in the Dharma, or take refuge in the bhikṣusaṃgha.' This is spoken three times in this manner. If it falls short of three times, the Three Refuges remain intact."