Hadithcore
Sahih Muslim, 1555 c
sahih

Anas (Allah be pleased with him) reported Allah's Messenger (ﷺ) as saying:

If Allah does not fructify them, then what is permissible for one of you to take the wealth of his brother?

حَدَّثَنِي مُحَمَّدُ بْنُ عَبَّادٍ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ ‏

‏ إِنْ لَمْ يُثْمِرْهَا اللَّهُ فَبِمَ يَسْتَحِلُّ أَحَدُكُمْ مَالَ أَخِيهِ ‏

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References2 variants
In-Book Reference
Book 22, Hadith 18
USC-MSA web (English) reference
Book 10, Hadith 3775 (deprecated numbering scheme)