To Gain and to Give: Hilchot Tzedakah, Day 11

It is a mitzvah to take off ma’aser, a tenth from one’s earnings and give it to tzedakah. In doing so, one becomes a partner with Hashem in all of their business pursuits, because their earnings are divided between themselves and the needy. 

פוסקים סו"ס שלב, אהבת חסד פ"כ