四分律行事鈔資持記 1.784

1.784

尼捨戒來，不偷形法，據非賊住。但由佛制尼無再受，故違捨之；望前在道，即同盜法，故名賊住。與前雖異，約過顯同。

When a nun renounces the precepts and comes back, she does not steal appearance or Dharma; strictly speaking, it is not living as a thief. However, because the Buddha prohibited nuns from receiving ordination a second time, she violated this by renouncing them; looking back to her former presence on the path, it is equivalent to stealing the Dharma, and hence it is called living as a thief. Although different from the former, in terms of fault it is shown to be the same.