四分律行事鈔資持記 3.52

3.52

六中，初明制刺。却即是倒，謂倒針刺。異俗者，彼唯直縫故。防外道者，有比丘直縫衣，為彼抽線使零脫故。又下，明補衣亦刺。四下，準決本宗。

In the sixth [section], it first explains the prescribed stitching. Que (却) means reverse; that is, stitching with reverse stitches. "To differ from the worldly": because they only stitch straight. "To guard against non-Buddhists": there were bhikṣus who stitched robes straight, and [non-Buddhists] pulled out the threads to make them unravel and fall apart. "Furthermore... below" explains that mending robes also uses [such] stitching. "Four... below" decisively resolves [the issue] according to our own school.