The Long Āgama Sūtra 12.6

12.6

爾時，世尊告諸比丘：「我與汝等說微妙法，義味清淨，梵行具足，謂三聚法。汝等諦聽！思惟念之！當為汝說。」時，諸比丘受教而聽。

It was then that the Bhagavān addressed the monks, “I will give all of you a discourse on the sublime teaching, the content and expression of which is pure and perfects the religious life. It’s the teaching in three categories. All of you, listen closely and consider it. I will teach this for you.”

The monks then accepted the teaching and listened.