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
suyuti:729a –
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السيوطي:٧٢٩a –

"احفظوا اليتامى في أموالهم كى لا تَأكُلَهَا الزكاةُ".  

الشافعى [طب] الطبرانى في الكبير عن عمرو بن شعيب عن أبيه عن جده

See similar narrations below:

Collected by Mālik, Suyūṭī
malik:17-14 – Yaḥyá > Mālik > Balaghah > ʿUmar b. al-Khaṭṭāb

Yahya related to me from Malik that he had heard that Umar ibn al-Khattab said, "Trade with the property of orphans and then it will not be eaten away by zakat."  

مالك:١٧-١٤ – حَدَّثَنِي يَحْيَى عَنْ مَالِكٍ أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ

قَالَ اتَّجِرُوا فِي أَمْوَالِ الْيَتَامَى لاَ تَأْكُلُهَا الزَّكَاةُ