system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Where does the saying "cats have 9 lives" come from?
gpt
Easy explanation: Because they're really good with their reflexes. They jump and land from heights we would break apart from.

More history:

An old English saying goes "A cat has nine lives. For three he plays, for three he strays, and for the last three he stays". The first three are the times where the cat is young. The next three are where it is in it's prime time and the last three are where it's too old to even catch mice. So first it plays, then it goes around, hunting and then it just stays home.

Cats are thought to be magical and have been worshipped in the past. The greek thought nine is the number of the "trinity of the trinities". 

Basically, people have always seen how sturdy these animals are and, back then, have thought they are magical.