From which poem does "The grass is blue and the sky is blue beside the ancient road outside the pavilion" come?

say goodbye to

Lyrics: Li Shutong (Master Hongyi)

Outside the pavilion, by the ancient road, the grass is blue.

The evening breeze blows the flute, and the sunset is beyond the mountain.

The horizon, the horizon, intimate friends are half scattered.

Life is once in a blue moon, only parting.

Outside the pavilion, by the ancient road, the grass is blue.

When will you return this? Don't hesitate to come.

The horizon, the horizon, intimate friends are half scattered.

A pot of turbid water has spilled all the joy, so let's bid farewell to Meng Han tonight.