From which poem does the idiom "childhood friends, two children have no guess" come from?

1. climb Jieshi to see the sea, and Rizhao incense burner to see the Milky Way. (The incense burner in Rizhao emits purple smoke, and it is suspected that the Milky Way has set for nine days.)

2. childhood friends have no guesses and are tied together for a long time. (the earth lasts forever, and the sky lasts forever; One day, both will end, and this endless sadness will continue forever. We hope to fly in heaven, and two birds will grow together on the earth with one wing, two branches of a tree. )