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.
suyuti:313a
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السيوطي:٣١٣a

"اتَّجرِوا في أموالِ اليَتَامَى، لا تَأكُلْهَا الزكاة".  

[طس] الطبرانى في الأوسط عن أنس (وصُحح)

See similar narrations below:

Collected by Mālik, Suyūṭī
malik:17-14Yaḥyá > 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:١٧-١٤حَدَّثَنِي يَحْيَى عَنْ مَالِكٍ أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ

قَالَ اتَّجِرُوا فِي أَمْوَالِ الْيَتَامَى لاَ تَأْكُلُهَا الزَّكَاةُ