When Abu Bakr appointed him, he wrote for him, "In the name of Allah, the Most Gracious, the Most Merciful. This is the obligatory charity which the Messenger of Allah ﷺ imposed upon the Muslims, which Allah commanded His Messenger to enact." He then mentioned the hadith, in which he said, "What is separate is not to be combined, nor is what is combined to be separated, out of fear of paying charity. Whatever belongs to two partners, they settle accounts between themselves equally."
إن أبا بكر لما استخلفه كتب له: بسم الله الرحمن الرحيم، هذه فريضة الصدقة التي فرضها رسول الله ﷺ على المسلمين التي أمر الله بها رسوله فذكر الحديث. وقال فيه: لا يجمع بين متفرق ولا يفرق بين مجتمع خشية الصدقة، وما من خليطين فهما يتراجعان بينهما بالسوية.
Bukhari narrated it in the Book of Zakat (1451), from Muhammad bin Abdullah, who said, "My father narrated to me, who said, 'Thumamah narrated to me, that Anas narrated to him,'" and he mentioned the hadith.