הלכה על כתובות 134:8

And they, may their memory be blessed, said (Ketuvot 67b) that we trick a poor person who does not want to take [charity] and we give it to him [as] a loan, and afterwards we do not ask it back from him. But we do not pay attention to a wealthy person who torments himself and who has a bad eye with his [own] money. And they, may their memory be blessed, said (Ketuvot 67b), "'Enough for his lack' (Deuteronomy 15:8) - you are commanded to fill his lack, but you are not commanded to make him wealthy." And Rambam, may his memory be blessed, wrote (Mishneh Torah, Laws of Gifts to the Poor 9:3) that he never saw and never heard of a city that has ten [or more] from Israel that did not have a charity fund. And they, may their memory be blessed, said that even a poor person that sustains himself from charity is obligated to [give] charity if he finds someone [more needy] than he, who needs it. And they, may their memory be blessed, said (Mishneh Torah, Laws of Gifts to the Poor 10:2) that no man ever came to poverty because of doing too much charity (tsedekah), as it is stated (Isaiah 32:17), "And the work of righteousness (tsedekah) shall be peace." And Israel is only redeemed in the merit of charity, as it is stated (Isaiah 1:27), "Zion will be redeemed with justice (tsedekah)." [These] and the rest of its details are in [several] scattered places in the Talmud, but most of them are in Tractate Ketuvot (Chapter 6) and in Bava Batra (Chapter 1).