Musar do Przysłów 10:22

A parable will illustrate this (Deut. Rabbah 3:3). There is a story about Rabbi Simon, the son of Shetah, who purchased a donkey from an Ishmaelite. His pupils went and found a precious stone hanging from the donkey's neck. They said to him, "Rabbi, 'The blessing of the Lord, it maketh rich' " (Prov. 10:22). He said to them, "I purchased a donkey; — a precious stone I did not purchase." So he went and returned the gem to that Ishmaelite. And the Ishmaelite called out concerning him, "Blessed is the Lord the God of Simon, the son of Shetah." There is a similar instance in the Jerusalem Talmud (Baba Mezi'a 2:5). Some mise men of old purchased wheat from heathens, and found in this wheat a bundle of money, and they returned the money to them, and the heathens said, "Blessed is the God of the Jews." And similarly there are many stories of people who restored an object to sanctify the name of God.