俱舍論疏 30.51

30.51

論「亦觀問者至而發問故」，答也。彼謂已解脫我名為如來，故佛不答，同前失故也。

On the Śāstra's statement: "Also observing the questioner [...] and so asked the question": The reply. Because they considered the liberated self to be the Tathāgata, the Buddha did not answer, as it shares the same faults as before.