The Talmud (Bava Batra 11a) records a teaching that transformed how the sages understood the mechanics of divine reward: charity does not merely help the recipient — it literally saves the giver's life.
Rabbi Akiba's daughter was told by astrologers that she would die on the day of her wedding. A snake would bite her, and she would perish. Rabbi Akiba was deeply troubled but said nothing. On the night of her wedding, his daughter removed a brooch from her hair and stuck it into a crack in the wall. The next morning, she pulled the brooch out — and a dead snake came with it. The pin had pierced the serpent's eye during the night.
"What did you do yesterday?" Rabbi Akiba asked her. She replied: "A poor man came to the door during the wedding feast. Everyone was busy celebrating, and no one noticed him. So I took the portion that had been given to me and gave it to him."
Rabbi Akiba declared: "You have done a mitzvah — and charity saves from death." The verse in Proverbs (10:2) was proven literally true: "Righteousness delivers from death." Not in the next world alone, but in this world, on this night, through the simple act of giving food to a hungry man.
The sages debated whether charity changes a divine decree or whether the decree was always conditional on the person's actions. Either way, the lesson was the same: what you give away may be the very thing that saves you.