佛說目連問戒律中五百輕重事經 2.140

2.140

問：「受三歸法要終身。復可得一年半年十日五日不？」答：「隨意多少。」

Question: "Must the Dharma of receiving the Three Refuges necessarily be for the rest of one's life, or may it be for one year, half a year, ten days, or five days?" Answer: "It may be for whatever duration one wishes."