四分律刪繁補闕行事鈔 1.384

1.384

一邊罪難者。謂先受具戒，毀破重禁，捨戒還來，欲更受具。此人罪重，名佛海邊外之人，不堪重入淨戒海也！乃至準《論》：白衣五戒、八戒，沙彌十戒，破於重者，同名邊罪。

First, the antima-vatthu impediment. This refers to someone who previously received the full upasampadā, broke a grave prohibition, relinquished the precepts, and returned wishing to receive the full upasampadā again. This person's offense is grave; they are called 'a person outside the shore of the Buddha's ocean,' unfit to enter again into the ocean of pure precepts! Furthermore, according to the treatises: for a layperson with the five precepts or eight precepts, or a śrāmaṇera with the ten precepts, to break a grave one is likewise called an antima-vatthu [offense].