梵網經菩薩戒本疏 6.5

6.5

三、釋名者，任己無知，隨諸惡友，捨大乘之珍寶，習邪小之瓦礫，戒防此失，故以為名。

Third, explaining the name: Indulging one's own ignorance, following various bad friends, abandoning the precious jewel of the Mahāyāna, and practicing the broken tiles of the erroneous and small—the precept guards against this fault; hence it is named accordingly.