How did we come to say something courteous to someone after they’ve sneezed

https://sh.itjust.works/post/4253316

How did we come to say something courteous to someone after they’ve sneezed - sh.itjust.works

How/why did saying things like bless you or gesundheit start? And when?

It’s because the demons fly out of you when you sneeze, and you need to be blessed to prevent them from getting back in, or so they thought back in Black Plague days.