karma
Karma and Samsara are concepts from the ancient Hindu religion, which is still practiced in modern India.
The people who believe in reincarnation and karma are the Hindus and people in the Buddhism religion.
Buddhism & Hinduism
by their karma or actions.
They practice Islam religion.
I don't know WHO, but the Hindu religion did.
Hinduism.
Hindu
The whole bible talks about Hogwarts your actions reflect on your faith and religion. In a nnutshell that is karma.
Karma probably exists to those whose religion is Hindu or Buddhist, or in other words, if you believe in it, it probably will exist to you.
Sin and forgiveness are dealt with in terms of karma. In order to make up for negative karma, one must do good deeds to gain positive karma.