Al-Mukhtasar
ٱلَّذِينَ يَلْمِزُونَ ٱلْمُطَّوِّعِينَ مِنَ ٱلْمُؤْمِنِينَ فِى ٱلصَّدَقَـٰتِ وَٱلَّذِينَ لَا يَجِدُونَ إِلَّا جُهْدَهُمْ فَيَسْخَرُونَ مِنْهُمْ ۙ سَخِرَ ٱللَّهُ مِنْهُمْ وَلَهُمْ عَذَابٌ أَلِيمٌ ﴿٧٩﴾
Those who find fault with the believers who voluntarily give a little charity, who only find a little that they are able to give, and they poke fun at them – saying: Of what use is their charity? – Allah mocks them in return for their mocking the believers; and they will receive a painful punishment.