Aruch HaShulchan, Laws of Tzedakah, 248:15

A most generous person who gives tzedakah beyond their financial ability or squeezes themselves to give to the collector in order not to shame themselves, it is forbidden to demand and collect tzedakah from them, and the collector who shames them by asking for money, in the future the Holy One will punish that person. So the sages said (Baba Batra 8a) that as it is written, “I will punish all that oppress them,” this has been extended to tzedakah collectors who pressure givers into giving when the giver is not “estimated” to give that amount.... [Translation by Rabbi Bruce Elder. Edited for gender neutrality]