佛說目連問戒律中五百輕重事 1.61

1.61

問：「大僧盡行，唯有沙彌在界。為得不？」答：「但有一清信士，界便不壞，況復沙彌。盡無，一宿界壞。若僧盡去不還，亦不須解。」

Question: "If the fully ordained monks (upasampanna) have all departed and only novice monks remain within the sīmā, is it valid?" Answer: "As long as there is a single pure-believing layman (upāsaka), the sīmā is not destroyed, let alone novice monks. If all are absent, after one night the sīmā is destroyed. If the saṅgha departs completely and will not return, there is also no need to dissolve it."