The Netziv and the Man Who Sold His Olam Haba
A man jokingly sells his share in Olam Haba for a ruble and then wants it back; the Netziv rules the sale is void, since the reward for mitzvos cannot be sold.
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A man jokingly sells his share in Olam Haba for a ruble and then wants it back; the Netziv rules the sale is void, since the reward for mitzvos cannot be sold.
The Rashash, a wealthy banker, could not explain a difficult Tosfos until the younger, poorer Netziv solved it, and explained why toil in Torah made the difference.