佛說目連問戒律中五百輕重事經 1.81

1.81

問：「結坐受七日法，為坐初受、為臨行時受？」答：「若坐初受者好。坐初不受，亦可臨行時受。夫受七日法，行不滿七日還，後行不復更受。計滿七日，乃復更受。若慮忘，亦可日受。」

Question: "When establishing the retreat and receiving the seven-day rule, is it received at the beginning of the retreat, or received when about to depart?" Answer: "If received at the beginning of the retreat, it is good. If not received at the beginning of the retreat, it may also be received when about to depart. Now, having received the seven-day rule, if one travels and returns in less than seven days, when traveling later one does not receive it again. Only when the full seven days are counted does one receive it again. If one fears forgetting, one may also receive it daily."