What is the origin of Kakashi's first round of eyes in Naruto?

Kakashi, who has just been promoted to forbearance, is working with his companions at the age of twelve. Among them, a female ninja named Lin was taken away, and another named Lin said she would save her. Kakashi refused, and later he said a word in earth, which moved Kakashi. Later, Kakashi also went. Later, in the cave where Lin was trapped, Kakashi was pushed away with earth because of the collapse of rocks, and half of his body was smashed, saying, "I can't leave. I haven't given you any gifts since you were promoted to forbearance." Don't worry, it's not a bad thing ... Lin, transplant my sharingan into Kakashi's eyes, Kakashi, and I'll be your eyes, so you can see the future clearly ... "Kakashi can use the quick trick of a thousand birds because he shares the sweetness with the soil, because four generations say that a thousand birds are very risky and fast for users. More specifically, kakashi gaiden 439-449. Very touching! LZ, pick me. Typing is difficult ... it's really written one by one. ...