佛說目連問戒律中五百輕重事經 2.172

2.172

問：「白衣時從沙彌受五戒，然後出家受大戒。本師故是沙彌，得呼為師不？」答：「得呼為師，但不得為禮，沙彌應作禮。白衣時從尼受五戒，然後出家亦爾。」

Question: "If one received the five precepts from a śrāmaṇera while a layperson, and later went forth and received the full ordination, while the original master is still a śrāmaṇera, may he be called 'master'?" Answer: "He may be called 'master,' but one may not pay obeisance to him; the śrāmaṇera should pay obeisance [to the bhikṣu]. It is likewise if one received the five precepts from a nun while a layperson and later went forth."