四分律行事鈔資持記 3.1091

3.1091

獨行中，同上三緣；初至處行，即第一緣。根本，即發足時。又下，即第二緣。《四分》下，第三緣。

Regarding walking alone, this is identical to the three conditions above: first, walking to a destination is the first condition. The root [offense] occurs at the moment of setting out on foot. From 'Furthermore' below is the second condition. From 'The Dharmaguptaka' below is the third condition.