Hinduism is not a religion. It’s a way of living. There is none can claim who founded this way of praying. None knows when it was created and where it is heading over.
There are many teaching most of the modern people believe as it’s a superstitious beliefs. If you are one believing in vibrations around you and the negative/ positive frequency around you, it’s certain that we should believe in the negative thoughts and talks. We should avoid to such negative aura around us.
Such thoughts we are taught not to deliver in few places where we should not say ” see you again” and we should rather say “Bye”
To a doctor
When we go to a doctor , we go for a physical or mental problem and when we leave the place from a doctor we should say ” Bye” rather ” See you” because, we believe that we will not come again for such problem again.
To a Lawyer
When we go to a lawyer, we don’t go for any good thing, rather some problems at life. When we leave him we should rather say “Bye” meaning the same, I will not come to you for any such problem again.
At the funeral place
When we go for a funeral, we should say “Bye” it means, such a bad time won’t come again to you , I won’t happen to come again here, so “Bye”.
So people not limited to these incidents there might be more, but it’s upto you to believe in or not. Say in comments what you feel.