俱舍論疏 4.32

4.32

「論曰至餘則不起」，釋心、心所必定俱也。無有心王起時不兼心所，心所起時不兼心王，故言必俱。非謂心王而與一切種類心所俱也。

On "The Śāstra says... otherwise they do not arise": this explains that mind and mental factors are necessarily concurrent. There is never a time when the primary mind arises without being accompanied by mental factors, nor when mental factors arise without being accompanied by the primary mind; hence it says they are necessarily concurrent. It does not mean that the primary mind is concurrent with all types of mental factors.