The Kishkindha Kandam also includes the famous story of : Vali had been cursed by Sage Matanga to never set foot on Mount Rishyamukha, which is why he could not reach Sugriva there. It also emphasizes dharma through Rama’s controversial killing of Vali from behind a tree—an act he justifies as punishing Vali for his immoral treatment of Sugriva and his wife.
Here's the completed text for (the fourth book of the Ramayana ): kishkindha kandam
After the death of the demon king Ravana's brother, Khara, and the abduction of Sita, Rama and Lakshmana arrive at the lake Pampa, where they meet the sage Shabari. She guides them toward friendship with the monkey king Sugriva, who is hiding on Mount Rishyamukha, fearing his older brother Vali. The Kishkindha Kandam also includes the famous story
– The Book of the Monkey Kingdom