金剛經纂要刊定記 2.254

2.254

"Pure precepts": this refers to the two hundred and fifty precepts for a bhikṣu and the five hundred precepts for a bhikṣuṇī, which have manifest reception and unmanifest upholding; purely upholding the precepts is called pure precepts. Some explain five meanings, namely adding pure livelihood and destroying evil. Here, since mendicancy is itself pure livelihood and pure precepts is itself destroying evil, there are only three.