Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “The best house among the Muslims is the one in which an orphan is treated well. The worst house among the Muslims is the one in which an orphan is mistreated. The one who cares for an orphan and myself will be in Paradise like this,” and he held his two fingers together.

Source: Al-Adab Al-Mufrad 137

Grade: Hasan (fair) according to Al-Bukhari

عَنْ أَبِي هُرَيْرَةَ قَالَ‏ قَالَ رَسُولُ اللهِ صلى الله عليه وسلم‏ خَيْرُ بَيْتٍ فِي الْمُسْلِمِينَ بَيْتٌ فِيهِ يَتِيمٌ يُحْسَنُ إِلَيْهِ وَشَرُّ بَيْتٍ فِي الْمُسْلِمِينَ بَيْتٌ فِيهِ يَتِيمٌ يُسَاءُ إِلَيْهِ أَنَا وَكَافِلُ الْيَتِيمِ فِي الْجَنَّةِ كَهَاتَيْنِ يُشِيرُ بِإِصْبَعَيْهِ‏

الأدب المفرد البخاري بَابُ خَيْرُ بَيْتٍ بَيْتٌ فِيهِ يَتِيمٌ يُحْسَنُ إِلَيْهِ 137