"The parable of the miser and the one who gives in charity is that of two men wearing coats of mail with their hands tied to their collarbones. Every time the one who gives thinks of giving in charity, the (coat of mail) expands until it obliterates his traces, and every time the miser thinks of giving charity, every circle (of the coat of mail) contracts and sticks to him, and his hand is tied up to his collarbones." I heard the Messenger of Allah say: "He tries to expand it, but he cannot." (Using translation from Nasāʾī 2548)
عَنِ النَّبِيِّ ﷺ قَالَ مَثَلُ الْبَخِيلِ وَالْمُتَصَدِّقِ مَثَلُ رَجُلَيْنِ عَلَيْهِمَا جُنَّتَانِ مِنْ حَدِيدٍ قَدِ اضْطُرَّتْ أَيْدِيهِمَا إِلَى تَرَاقِيهِمَا فَكُلَّمَا هَمَّ الْمُتَصَدِّقُ بِصَدَقَةٍ اتَّسَعَتْ عَلَيْهِ حَتَّى تُعَفِّيَ أَثَرَهُ وَكُلَّمَا هَمَّ الْبَخِيلُ بِصَدَقَةٍ انْقَبَضَتْ عَلَيْهِ كُلُّ حَلْقَةٍ مِنْهَا إِلَى صَاحِبَتِهَا وَتَقَلَّصَتْ عَلَيْهِ قَالَ فَسَمِعْتُ رَسُولَ اللهِ ﷺ يَعْنِي يَقُولُ فَيَجْهَدُ أَنْ يُوَسِّعَهَا فَلَا تَتَّسِعُ