四分律行事鈔資持記 2.1173

2.1173

六中，《僧祇》。楊枝分咽不咽，氷雪約人有無。《四分》。楊枝不分兩用，故令準上。

In the sixth, the Mahāsāṃghika-vinaya distinguishes tooth-sticks by swallowing or not swallowing, and ice and snow by the presence or absence of people. In the Dharmaguptaka-vinaya, tooth-sticks are not distinguished by two uses, so it instructs to follow the above.