Hadith 5:663
Waki’ narrated to us, from Sufyan, from Abu Ishaq, from Hubayrah, from Abdullah, who said: He used to give us [a share] from the messengers (or envoys/emissaries), and he would purify it (pay zakat on it).
حدثنا وكيع عن سفيان عن أبي إسحاق عن هبيرة عن عبد الله قال كان يعطينا في الرسل فيزكيه