大毘盧遮那成佛經疏 2.22

2.22

經云「復以此為因，於六齋日，施與父母男女親戚。是第二牙種」者，此六齋日，即是《智度》中「上代五通仙人，勸令此日斷食。既順善法，又免鬼神災橫。」如彼廣說也。由見止息貪求，內獲利樂故、欲修習此法令得增長故，於持齋之日捨己財物以與六親，自念：「我無守護之憂，而令他人愛敬，獲孝義之譽。」以見此因果故，轉生歡喜。歡喜故，善心稍增，由如從種子生牙也。

The sūtra says: "Further taking this as a cause, on the six fast days, one gives to parents, sons, daughters, and relatives. This is the second: the sprout seed." These six fast days are those of which the *Mahāprajñāpāramitopadeśa* says: "Ancient rṣis of the five superknowledges exhorted people to abstain from food on these days. It both accords with wholesome dharmas and avoids calamities from ghosts and spirits," as explained there at length. Seeing that ceasing craving brings inner benefit and joy, and wishing to practice this dharma to make it grow, on the fast day they give away their own wealth and possessions to their six relations, thinking to themselves: "I am free from the worry of guarding it, while causing others to love and respect me, and I obtain a reputation for filial piety and righteousness." Seeing this cause and effect, their joy increases further. Because of joy, their wholesome mind slightly increases, just as a sprout grows from a seed.