(2) باب الإِحْسَانِ إِلَى الأَرْمَلَةِ وَالْمِسْكِينِ وَالْيَتِيمِ
Abu Huraira reported that Allah's Messenger (ﷺ) said:
One who looks after the orphan whether he is his relative or not, I and he would be together in Paradise like this, and Malik (explained it) with the gesture by drawing his index finger and middle finger close together.
Reference: Sahih Muslim 2983
In-book reference: Book 55, Hadith 52
USC-MSA web (English) reference(deprecated numbering scheme): Book 42, Hadith 7108