四分律刪繁補闕行事鈔 1.122

1.122

三道行界者。《薩婆多》云：比丘遊行時，隨所住處縱廣，有拘盧舍界；此中不得別食、別布薩。亦不明大小？此論解《十誦》律文云：六百步為拘盧舍。

Third, the boundary while traveling on the road: The Sarvāstivāda states: 'When a monk is traveling, according to where he stays, in length and breadth there is a krośa boundary; within this, one must not eat separately or observe upoṣadha separately.' Nor is its size clarified. This treatise, explaining the Daśādhyāya-vinaya text, states: 'Six hundred paces make a krośa.'