תלמוד על אבות 3:10

He would also say: Anyone who helps his friend perform a mitzvah, the Torah considers it as if he had done it himself. A parable: To what can this be compared? [It can be compared] to a human king who captured a bird and gave it to one of his servants. The king said to him: Be careful with this bird. For if you treat it with care, all will be well. But if you do not, I will take your life for it. So did the Holy Blessed One say to Israel: If you observe these words of Torah that I have given to you, all will be well. But if not, I will take your lives because of them, as it says (Deuteronomy 4:9), (“Just be very careful to protect your life, lest you forget these things that your eyes have seen.”) (And in Deuteronomy 32:47), “It is not an empty thing for you, for it is your very life.”