俱舍論頌疏論本 30.43

30.43

謂佛至言真法性者，釋前標也。無我之教是佛至言，無我之理是真法性，教之與理俱涅槃因，淨因道矣。

[The line] "Namely, the supreme words of the Buddha, the true nature of phenomena" explains the preceding statement. The teaching of non-self is the supreme word of the Buddha; the principle of non-self is the true nature of phenomena. Both the teaching and the principle are causes of nirvāṇa, the path of pure causes.