At-Tawba 9:79

Those who disparage the believers who voluntarily give charities and ridicule them for having nothing to give except their effort[63]. Allah will ridicule them, and for them there will be a painful punishment.

[63] They hurtle sneering comments on both the well-off who give generously, saying that they do so out of show off, and those who can only help with the very little they have, and deride them for it.

Those who criticize the contributors among the believers concerning [their] charities and [criticize] the ones who find nothing [to spend] except their effort, so they ridicule them - Allāh will ridicule them, and they will have a painful punishment.

79. Those who defame such of the believers who give charity (in Allâh’s Cause) voluntarily, and such who could not find to give charity (in Allâh’s Cause) except what is available to them - so they mock at them (believers); Allâh will throw back their mockery on them, and they shall have a painful torment.

Those who point at such of the believers as give the alms willingly and such as can find naught to give but their endeavours, and deride them - Allah (Himself) derideth them. Theirs will be a painful doom.