What are the idiom stories about how to make friends?

At the end of the Eastern Han Dynasty, North Korea's political corruption, coupled with years of famine, made people's lives very difficult. Liu Bei intends to save the people, and Zhang Fei and Guan Yu are also willing to do something with Liu Bei. The three of them hit it off and chose Zhangfeizhuang as the Peach Blossom Garden. At this time, the peach blossoms are in full bloom and the scenery is beautiful. Zhang Fei prepared a green cow and a white horse as sacrifices, burned incense and prayed, and took the oath. Three people recognized their brother by their age. Liu Bei became the eldest brother, Guan Yu the second and Zhang Fei the third. This is the famous "taoyuan sworn" in the romance of the three kingdoms.

2. Best friend who never looks back

During the Warring States Period, the philosopher Zhuangzi talked about Zi Si, Zi Xing, Gigi Lai and Zi Lai, saying, "A heart of inaction, a backbone of action, a bottom of death, knowing life and death as one, who can be friends?" The four of them smiled at each other and felt that they were rebellious and became good friends with each other.

3. Give your life for your friends

According to legend, during the Warring States Period, Zuo He met each other and went to the State of Chu to seek audience. On the way, they met with heavy snow. At that time, they were wearing thin clothes and didn't have enough food. Zuo gave all his clothes and food to make friends, and hid himself in an empty tree and committed suicide. Later generations called this intimate friend with profound friendship "Zuo Yang".