Book 15: 《衛靈公》 Wei Ling Gong (Duke Ling of Wey)
《衛靈公》 Passage 15.42
師冕見，及階，子曰：「階也。」及席，子曰：「席也。」皆坐，子告之曰：「某在斯，某在斯。」師冕出。子張問曰：「與師言之道與？」子曰：「然。固相師之道也。」
Legge Translation (1861)
The Music-master, Mien, having called upon him, when they came to the steps, the Master said, "Here are the steps."When they came to the mat for the guest to sit upon, he said, "Here is the mat."
When all were seated, the Master informed him, saying, "So and so is here; so and so is here."
The Music-master, Mien, having gone out, Zizhang asked, saying. "Is it the rule to tell those things to the Music-master?"
The Master said, "Yes. This is certainly the rule for those who lead the blind."