俱舍論記 6.194

6.194

「第二無間至故成第三」者，經部解。第二集諦無間聖見滅諦，及佛經說故成第三。

On "Immediately after the second [up to] hence it constitutes the third": the Sautrāntika explains. Immediately following the second, the truth of origination, the noble one perceives the truth of cessation; and because the Buddha's sūtra teaches it so, it constitutes the third.