When ever a Jewish person said something good, they always said “Kennahera”.
It prevented a kind of jinx. It wards off the evil eye.
This is basic preventative magic. It’s like a Jewish version of ‘knocking on wood’. It’s just a way of trying to control the uncontrollable– also, I notice that unlike knock on wood, you say it when something GOOD is brought up. I think this is because, at least form my family, the Jewish culture seems to always expect negative things to happen.