佛說目連問戒律中五百輕重事 1.81

1.81

問：「結坐受七日法，為坐初受、為行時受？」答：「若坐初受者好，臨行時受亦得。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 entering the retreat and accepting the seven-day rule, is it accepted at the beginning of the retreat, or when traveling?" Answer: "It is good if accepted at the beginning of the retreat, but accepting it when about to travel is also permissible. As for accepting the seven-day rule: if one travels and returns before the seven days are full, one does not need to accept it again for a later journey. Only when the count of seven days is completed does one accept it again. If one fears forgetting, one may also accept it day by day."