Quran 9:79 At-Tawbah, ayah 79 of 129

ٱلَّذِينَ يَلْمِزُونَ ٱلْمُطَّوِّعِينَ مِنَ ٱلْمُؤْمِنِينَ فِى ٱلصَّدَقَـٰتِ وَٱلَّذِينَ لَا يَجِدُونَ إِلَّا جُهْدَهُمْ فَيَسْخَرُونَ مِنْهُمْ ۙ سَخِرَ ٱللَّهُ مِنْهُمْ وَلَهُمْ عَذَابٌ أَلِيمٌ ۝٧٩

9:79 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.