瑜伽論記 2.390

2.390

三不善根，唯識說具二義：一、根本煩惱性；二、遍六識故。餘非不善根，生惡勝故，唯立此三。

Regarding the three unwholesome roots, the Vijñaptimātratāsiddhi says that they possess two meanings: first, they have the nature of root afflictions; second, they pervade the six consciousnesses. The rest are not unwholesome roots; because these are superior in producing evil, only these three are established.