Abu Bakr wrote to me what was made compulsory by Messenger of Allah ﷺ and that was (regarding the payments of Zakat): Neither the property of different people may be taken together nor the joint property may be split for fear of (paying more, or receiving less) Zakat.  

أَنَّ أَبَا بَكْرٍ ؓ كَتَبَ لَهُ الَّتِي فَرَضَ رَسُولُ اللَّهِ ﷺ وَلاَ يُجْمَعُ بَيْنَ مُتَفَرِّقٍ وَلاَ يُفَرَّقُ بَيْنَ مُجْتَمِعٍ خَشْيَةَ الصَّدَقَةِ