Which book is the poem of 'Walking Thousands of Mountains'?

Traveling thousands of miles is not a fixed theme of a novel or poem. It may come from different literary works or storylines. However, this phrase often appeared in novels or literary works to describe the protagonist's great efforts and risks in order to achieve a certain goal. There could be many sources for this sentence. The following are some of the possible sources: - In Journey to the West, Sun Wukong experienced countless adventures and challenges in order to obtain the true scriptures. - In the Water Margins, Lin Chong walked alone on Liangshan Lake for many days in order to save his wife and children. In Dream of the Red Chamber, Jia Baoyu often traveled the Jianghu to explore the unknown world in order to avoid the dangers of officialdom. - In The Scholars, Wu Yong had to go through many obstacles in order to obtain fame. Therefore, the exact origin of the phrase 'walk thousands of miles' might vary from person to person.