Quran 9:79 from Surah At-Tawba on Divine Marvels.
ٱلَّذِينَ يَلۡمِزُونَ ٱلۡمُطَّوِّعِينَ مِنَ ٱلۡمُؤۡمِنِينَ فِي ٱلصَّدَقَٰتِ وَٱلَّذِينَ لَا يَجِدُونَ إِلَّا جُهۡدَهُمۡ فَيَسۡخَرُونَ مِنۡهُمۡ سَخِرَ ٱللَّهُ مِنۡهُمۡ وَلَهُمۡ عَذَابٌ أَلِيمٌ
English translation: Those who criticize the ones who give willingly of the believers concerning the charities and those who not find except their effort so they ridicule them Allah will ridicule Allah will ridicule them and for them (is) a punishment painful
Transliteration: alladhina yalmizuna al-mutawi'ina mina al-mu'minina fi al-sadaqati wa-alladhina la yajiduna illa juh'dahum fayaskharuna min'hum sakhira al-lahu min'hum walahum adhabun alimun