大慧普覺禪師宗門武庫 1.52

1.52

三佛在五祖時，甞於一亭上夜話歸方丈，燈已滅，五祖乃於暗中曰：「各人下轉語。」佛鑑對曰：「彩鳳舞丹霄。」佛眼曰：「鐵蛇橫古路。」佛果云：「看脚下。」五祖云：「滅吾宗者，乃克勤爾。」

When the Three Buddhas were with Wuzu, they once had an evening talk at a pavilion and returned to the abbot's quarters. The lamp had already gone out, and Wuzu said in the darkness, "Each of you, produce a turning word!" Fojian replied, "A colorful phoenix dances in the cinnabar skies." Foyan said, "An iron snake lies across the ancient road." Foguo said, "Watch your step!" Wuzu said, "The one who will extinguish my school is none other than you, Keqin!"