(75) بَابُ فَضْلِ مَنْ يَعُولُ يَتِيمًا مِنْ أَبَوَيْهِ
Sahl ibn Sa'd reported that the Prophet, may Allah bless him and granthim peace, said, "I and the guardian of the orphan will be in the Gardenlike that," indicating his forefinger and middle finger.
Reference: Al-Adab Al-Mufrad 135
In-book reference: Book 7, Hadith 7
English translation: Book 7, Hadith 135