仁王護國般若波羅蜜多經疏 2.123

2.123

解曰：五蘊色心積聚為義，實相非聚，故言不住；體遍色心，故云不離。從此第四四大即離。

Explanation: The five aggregates of form and mind have the meaning of accumulation. The real mark is not an accumulation, hence it is said to "not abide"; its substance pervades form and mind, hence it is said to "not be separated". From here is the fourth, identity and separation regarding the four great elements.