"fenglingdu mouth meet at the beginning, a see Yang Guo lifelong.", where does this sentence come from?

These two poems are from the novel "The Condor Heroes" written by Mr. Jin Yong, which is about the character Guo Xiang in the novel. The full text of the poem is as follows:

When fenglingdu first met, he saw Yang Guo for life. I only hate that I am old when I was born, and I remember my old friends before the heartbroken cliff.

Guo Xiang, a character in Jin Yong's novel The Condor Heroes, also appeared at the beginning of The Dragon Slayer with Eternal Tenderness. The name comes from parents' belief in guarding Xiangyang, and the twin brother is Guo Polu. Guo Xiang is beautiful and heroic, and looks like Huang Rong in three points. Because his style is both good and evil, Jianghu people call him "Little East Evil".

when Guo Xiang was 15 years old, she met Yang Guo. Yang Guo gave her three gold needles and held a birthday party for her at the Beggars' Guild Conference, which she will never forget. Guo Xiang left home to travel at the age of 18, and failed to pursue the condor man all his life. When Jue Yuan, the master of Shaolin School, passed away, he mumbled some verses of Jiuyang Shengong, which Guo Xiang memorized. When Xiangyang city was broken, her family was killed, and she escaped with the heavenly sword. At the age of 4, I realized that I would become a nun and never marry. After that, he founded Emei Sect in Sichuan, and his disciples were Teacher Fengling, Teacher Extinction, Zhou Zhiruo and others.

Extended information:

Guo Xiang walked the rivers and lakes, from north to south, and from east to west, almost all over the Central Plains, hoping to meet Yang Guo, but he never heard anyone talk about the recent news of Yang Guo, the great warrior of the condor, and never saw him again. During this period, the Song Dynasty died and the Yuan Dynasty flourished, and flowers blossomed, and I don't know how many personnel vicissitudes he experienced. When Guo Xiang was in his forties, he suddenly realized that he had become a monk in Mount Emei and studied martial arts. Later, he accepted his disciples and became the Emei school of martial arts.

Mr. Jin Yong commented on Guo Xiang: Guo Xiang seems to be versatile, with his father's kindness, generosity and hospitality, and his mother's resourcefulness and playfulness. He does not depend on his parents, makes friends with Jianghu people, treats everyone equally, does not discriminate against short people, and gets along well with animals with little anger. She was once tied to a high platform. Between life and death, she chose not to be afraid of death, and she is a person with national integrity.

Reference: Baidu Encyclopedia-Guo Xiang.