(3) باب فِي الزَّكَاةِ وَأَنْ لاَ يُفَرَّقَ بَيْنَ مُجْتَمِعٍ، وَلاَ يُجْمَعَ بَيْنَ مُتَفَرِّقٍ، خَشْيَةَ الصَّدَقَةِ
Narrated Anas:
That Abu Bakr wrote for him, Zakat regulations which Allah's Messenger (ﷺ) had made compulsory, and wrote that one should neither collect various portions (of the property) nor divide the property into various portions in order to avoid paying Zakat.
Reference: Sahih al-Bukhari 6955
In-book reference: Book 90, Hadith 3
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 86, Hadith 87