四分律行事鈔資持記 3.909

3.909

七中。五事希有可貴，故名為寶。初二是勝境，餘三即行業，值佛聞法，發解起行，行成有驗，信樂立焉。

In the seventh [section]: Five things are rare and precious, hence they are called "jewels." The first two are superior objects; the remaining three are karmic practices: encountering the Buddha, hearing the Dharma, giving rise to understanding and initiating practice; when practice is accomplished and verified, faithful joy is established.