四分律比丘含注戒本 2.181

2.181

彼比丘指授三節未竟，當至不見聞處。若不至不見聞處，三節竟，墮。

(before the bhikṣu finishes directing the three layers, he should go to a place where he can neither see nor hear it. If he does not go to a place where he can neither see nor hear, and the three layers are completed, [it is a] prāyaścittika.)