Where did the saying he who saves a life save the world come from?

Answer 1

It is a paraphrasing of the Talmud.

"Whoever destroys a soul, it is considered as if he destroyed an entire world. And whoever saves a life, it is considered as if he saved an entire world."

- Babylonian Talmud, Sanhedrin 4:8 (37a)

Answer 2

The phrase "He who saves one life, saves the world entire" is from the Talmud, a central text of Rabbinic Judaism. It highlights the immense value of saving a human life and the impact it has on the world as a whole.