Positive commandment · Mitzvat Aseh #195 of 613
To give charity
ליתן צדקה
The verse · Devarim 15:8
כִּי־פָתֹחַ תִּפְתַּח אֶת־יָדְךָ לוֹ וְהַעֲבֵט תַּעֲבִיטֶנּוּ דֵּי מַחְסֹרוֹ אֲשֶׁר יֶחְסַר לוֹ
“but thou shalt open thy hand wide to him, and shalt surely lend him sufficient for his need, in that which he lacks.”
The Rambam’s words
To give charity, as [Deuteronomy 15:8] states: "You shall surely open your hand [to your poor brother]."
ליתן צדקה, שנאמר: "פתוח תפתח את ידך" (דברים טו,ח; דברים טו,יא).
Who & when
“And it is practiced in every place and at all times by males and females.”
Where in the Mishneh Torah
Hilchot Gifts to the Poor הלכות מתנות עניים