雲門匡真禪師廣錄 3.143

3.143

因喫茶次，問僧：「色香味觸具四塵，儞道茶具幾塵？」僧無語，師云：「不得辜負我。」

While taking tea, he asked a monk, "Form, fragrance, taste, and touch constitute the four dusts; you tell me, how many dusts does tea possess?" The monk was silent. The Master said, "Do not let me down."