The Long Āgama Sūtra 30.8

30.8

爾時，世尊於閑靜處天耳徹聽，聞諸比丘於食後集講堂上議如此言。爾時世尊於靜窟起，詣講堂坐，知而故問，問諸比丘：「向者所議，議何等事？」

The Bhagavān was in a quiet place at the time and overheard them clearly with his heavenly ear. He heard those monks saying this, having gathering up in the meeting hall after their meal. The Bhagavān then emerged from his quiet hut, went to the meeting hall, and sat down. Knowing it, he purposefully questioned them. He asked the monks, “You were having a discussion earlier. What was it that you were discussing?”