Allah, the Exalted, said:
رياض الصالحينAbū Zakariyyā Muḥyī al-Dīn Yaḥyā ibn Sharaf al-Nawawī٢٨٦ - باب تأكيد تحريم مال اليتيم
٢٨٦ - باب تأكيد تحريم مال اليتيم
ۖ
Indeed, those who devour the property of orphans unjustly are only consuming into their bellies fire. And they will be burned in a Blaze [i.e., Hellfire].
And the Exalted said:
وَلَا تَقْرَبُوا۟ مَالَ ٱلْيَتِيمِ إِلَّا بِٱلَّتِى هِىَ أَحْسَنُ حَتَّىٰ يَبْلُغَ أَشُدَّهُۥ ۖ وَأَوْفُوا۟ ٱلْكَيْلَ وَٱلْمِيزَانَ بِٱلْقِسْطِ ۖ لَا نُكَلِّفُ نَفْسًا إِلَّا وُسْعَهَا ۖ وَإِذَا قُلْتُمْ فَٱعْدِلُوا۟ وَلَوْ كَانَ ذَا قُرْبَىٰ ۖ وَبِعَهْدِ ٱللَّهِ أَوْفُوا۟ ۚ ذَٰلِكُمْ وَصَّىٰكُم بِهِۦ لَعَلَّكُمْ تَذَكَّرُونَ
And do not approach the orphan's property except in a way that is best [i.e., intending improvement] until he reaches maturity. And give full measure and weight in justice. We do not charge any soul except [with that within] its capacity. And when you speak [i.e., testify], be just, even if [it concerns] a near relative. And the covenant of Allāh fulfill. This has He instructed you that you may remember.
وقال تَعَالَى:
And the Exalted also said:
فِى ٱلدُّنْيَا وَٱلْـَٔاخِرَةِ ۗ وَيَسْـَٔلُونَكَ عَنِ ٱلْيَتَـٰمَىٰ ۖ قُلْ إِصْلَاحٌ لَّهُمْ خَيْرٌ ۖ وَإِن تُخَالِطُوهُمْ فَإِخْوَٰنُكُمْ ۚ وَٱللَّهُ يَعْلَمُ ٱلْمُفْسِدَ مِنَ ٱلْمُصْلِحِ ۚ وَلَوْ شَآءَ ٱللَّهُ لَأَعْنَتَكُمْ ۚ إِنَّ ٱللَّهَ عَزِيزٌ حَكِيمٌ
To this world and the Hereafter. And they ask you about orphans. Say, "Improvement for them is best. And if you mix your affairs with theirs - they are your brothers. And Allāh knows the corrupter from the amender. And if Allāh had willed, He could have put you in difficulty. Indeed, Allāh is Exalted in Might and Wise."
وعن أَبي هريرة - ﵁ - عن النبيِّ - ﷺ - قَالَ: «اجْتَنِبُوا السَّبْعَ المُوبِقَاتِ!» قالُوا: يَا رَسُولَ اللهِ، وَمَا هُنَّ؟ قَالَ: «الشِّرْكُ باللهِ، والسِّحْرُ، وَقَتْلُ النَّفْسِ الَّتي حَرَّمَ اللهُ إِلاَّ بالحَقِّ، وأكلُ الرِّبَا، وأكْلُ مَالِ اليَتِيمِ، والتَّوَلِّي يَوْمَ الزَّحْفِ، وقَذْفُ المُحْصَنَاتِ المُؤْمِنَاتِ الغَافِلاَتِ». متفق عَلَيْهِ. «المُوبِقَاتِ»: المُهْلِكات.
And on the authority of Abū Hurayrah (may Allah be pleased with him), from the Prophet (ﷺ), who said: "Avoid the seven ruinous sins!" They said: "O Messenger of Allah, what are they?" He said: "Associating partners with Allah (shirk), sorcery, killing a soul which Allah has forbidden except by right, consuming ribā (usury), devouring the property of the orphan, fleeing on the day of battle, and slandering chaste, believing, unsuspecting women." Agreed upon. «Al-mūbiqāt» means: the things that bring ruin.