'Urwa reported that he asked 'A'isha about the words of Allah:
" If you fear that you will not be able to observe equity in case of orphan girls" ; the rest of the hadith is the same but with a slight variation of wording. (ID)
Reference (ID): Sahih Muslim 3018 b (ID)
In-book reference (ID): Book 56, Hadith 7 (ID)
USC-MSA web (English) reference(deprecated numbering scheme): Book 43, Hadith 7157 (ID)