佛說目連問戒律中五百輕重事經 2.158

2.158

問：「不受五戒，得受十戒不？」答：「若先三自歸，得。以十戒中即有五戒，亦不復受。」

Question: "If one has not received the five precepts, may one receive the ten precepts?" Answer: "If one has first taken the Three Refuges, one may. Because the five precepts are already contained within the ten precepts, one does not need to receive them again."