הלכה על נדה 140:16

It is written:⁴Deuteronomy 25: 13–15. "You must not keep in your bag two different weights, one large and one small. You must not keep in your house two different measures, one large and one small. You must have a full, just weight, and you must have a full, just measure …" The words "your bag" and "your house" appear to be superfluous and our Rabbis, of blessed memory, explained:⁵Bava Basra 89a. "You shall have no money in your bag." Why is this so? Because you had different weights. "You shall lack the necessities of life in your house." Why is this so? Because you had different measures. But if full, just weight is in your house, then you will have money; and, similarly, if full and honest measure is in your house, then all your needs will be filled. Furthermore, our Rabbis of blessed memory said:"What should a man do to become rich? He should conduct his business honestly and ask for compassion from the One to Whom riches belong," as it is said:⁶Haggai 2: 8. "Mine is the silver and Mine is the gold."