4:6
وَابْتَلُواْ الْيَتَامَى حَتَّىَ إِذَا بَلَغُواْ النِّكَاحَ فَإِنْ آنَسْتُم مِّنْهُمْ رُشْداً فَادْفَعُواْ إِلَيْهِمْ أَمْوَالَهُمْ وَلاَ تَأْكُلُوهَا إِسْرَافاً وَبِدَاراً أَن يَكْبَرُواْ وَمَن كَانَ غَنِيّاً فَلْيَسْتَعْفِفْ وَمَن كَانَ فَقِيراً فَلْيَأْكُلْ بِالْمَعْرُوفِ فَإِذَا دَفَعْتُمْ إِلَيْهِمْ أَمْوَالَهُمْ فَأَشْهِدُواْ عَلَيْهِمْ وَكَفَى بِاللّهِ حَسِيباً
Make trial of orphans until they reach the age of marriage; if then ye find sound judgment in them, release their property to them; but consume it not wastefully, nor in haste against their growing up. If the guardian is well-off, Let him claim no remuneration, but if he is poor, let him have for himself what is just and reasonable. When ye release their property to them, take witnesses in their presence: But all-sufficient is Allah in taking account.
17:26
وَآتِ ذَا الْقُرْبَى حَقَّهُ وَالْمِسْكِينَ وَابْنَ السَّبِيلِ وَلاَ تُبَذِّرْ تَبْذِيراً
And render to the kindred their due rights, as (also) to those in want, and to the wayfarer: But squander not (your wealth) in the manner of a spendthrift.
17:27
إِنَّ الْمُبَذِّرِينَ كَانُواْ إِخْوَانَ الشَّيَاطِينِ وَكَانَ الشَّيْطَانُ لِرَبِّهِ كَفُوراً
Verily spendthrifts are brothers of the Evil Ones; and the Evil One is to his Lord (himself) ungrateful.
25:67
وَالَّذِينَ إِذَا أَنفَقُوا لَمْ يُسْرِفُوا وَلَمْ يَقْتُرُوا وَكَانَ بَيْنَ ذَلِكَ قَوَاماً
Those who, when they spend, are not extravagant and not niggardly, but hold a just (balance) between those (extremes);