Why do cats have nine lives in legend? Where does the allusion come from?

The allusion comes from this: "Buddhist Sutra" "The Buddha is calling his disciples to lecture, and there is a cat crouching under the Buddha's seat, holding its breath and listening. Disciples have a reason to ask the Buddha. Do you know the scriptures? Buddha said: cats have spirituality, their lives have nine, and people have only one. Therefore, the spirituality of cats is beyond human reach. " It is also clearly pointed out in the Buddhist scripture "Quotations on the Top": "Cats have nine lives, namely, communication, spirit, quietness, righteousness, sensation, light, essence, qi and spirit." Although these nine lives are incomprehensible, the Buddha said that there is only one indisputable fact for human beings. However, fewer and fewer people win one now.