俱舍論疏 19.66

19.66

論「既說有貪至不別顯示」，釋頌唯說有貪，不釋欲貪所以。既多緣自體名為有貪，准知多緣外境名欲貪也。

On the passage where the Śāstra says, 'Since existence-attachment is spoken of [...] does not separately show it': This explains why the verse only mentions existence-attachment and does not explain desire-attachment. Since mostly objectifying intrinsic identity is called existence-attachment, one can infer that mostly objectifying external objects is desire-attachment.