Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
muslim:3018b – al-Ḥasan al-Ḥulwānī And ʿAbd b. Ḥumayd > Yaʿqūb b. Ibrāhīm b. Saʿd from my father > Ṣāliḥ > Ibn Shihāb > ʿUrwah

" 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.  

مسلم:٣٠١٨b – وَحَدَّثَنَا الْحَسَنُ الْحُلْوَانِيُّ وَعَبْدُ بْنُ حُمَيْدٍ جَمِيعًا عَنْ يَعْقُوبَ بْنِ إِبْرَاهِيمَ بْنِ سَعْدٍ حَدَّثَنَا أَبِي عَنْ صَالِحٍ عَنِ ابْنِ شِهَابٍ أَخْبَرَنِي عُرْوَةُ أَنَّهُ سَأَلَ عَائِشَةَ عَنْ قَوْلِ اللَّهِ {وَإِنْ خِفْتُمْ

أَنْ لاَ تُقْسِطُوا فِي الْيَتَامَى} وَسَاقَ الْحَدِيثَ بِمِثْلِ حَدِيثِ يُونُسَ عَنِ الزُّهْرِيِّ وَزَادَ فِي آخِرِهِ مِنْ أَجْلِ رَغْبَتِهِمْ عَنْهُنَّ إِذَا كُنَّ قَلِيلاَتِ الْمَالِ وَالْجَمَالِ