In the holy book Me'am Lo'ez, written by Rabbi Yaakov Kuli, the following story is brought down. There was once a drought, and no rain fell in a town. The rabbi summoned all the people of the town to fast on Mondays and Thursdays and then to come pray in the main synagogue for Hashem to send rain. They prayed and prayed, and fasted and fasted, but they were not answered.
One night, the rabbi had a dream. In the dream, they told him from the shamayim (the heavens) that rain would come down only if a certain storekeeper came to the shul (synagogue), served as the chazan (prayer leader), and asked Hashem for rain. The rabbi woke up in the morning and couldn't believe the dream. The man he had dreamt about was a simple man, an am ha'aretz (a simple man) who knew nothing—not the person you would think should pray for the kahal (community) to have rain. So he dismissed the dream.
Lo and behold, a few nights later he had the same dream again. From the shamayim, they told him: “Only if this storekeeper comes and prays in the shul before Hashem for rain, then rain will come.” At this point, the rabbi had no choice, and he summoned all the people to come to the synagogue. Then he summoned the storekeeper and told him, “Now you be the chazan.” All the people of the town were shocked. The man was a simple man, an am ha'aretz. He didn't know anything. “He's going to be the chazan?” Even the storekeeper himself was surprised: Why had the rabbi chosen him? The rabbi ordered him, “You be the chazan, and pray for us for rain.”
The man left the synagogue for a short period and went to his store. He came back to the shul with the scales from his store. Then he went before the teva (prayer platform) and started praying to Hashem. He told Hashem, “Ribbono Shel Olam, almighty God, the two scales are connected, the two heys (letter heh) of Your name. The stick in the middle is the vav (letter vav) of Your name. And the handle that holds the scales is the yud (letter yud) in Your name. Hashem Almighty, if You know that I cheated with these scales, let fire come down from the heavens and consume me and my scales. But if You know that I dealt honestly in business and I never cheated, let rain come down from the shamayim.”
Immediately, rain started coming down. The rabbi turned to the kahal and told them, “My dear members of this town, look how many tzadikim (righteous people) prayed for rain, and Hashem didn't bring rain. And this man, who deals honestly in business with his scales—immediately, rain came. How good it is that a person deals honestly and rain comes down.”
Similarly, this story is told about the great Rabbi Shalom Chabshush, a great student from Porat Yosef, who taught Torah and learned Torah for no money. He had a grocery store and was very honest in business there. One day, he got new scales and kept checking them. His customers asked him, “Rabbi Shalom Chabshush, why are you checking the scales?” He told his customers, “Because the scales are connected to, and correspond to, the letters of the name of Hashem. I know the old scales were honest and good. Now I don't know if the new scales are doing the right job in order to make sure that the name of Hashem is not desecrated.”