Amr bin Shu'ayb narrates from his father, and he from his grandfather, that the Messenger of Allah (peace and blessings be upon him) said: "Sadaqat al-fitr is due upon both the town-dweller and the desert-dweller." Abu Isa (may Allah have mercy on him) says: I asked Imam al-Bukhari (may Allah have mercy on him) about this hadith, and he said: Ibn Jurayj did not hear from Amr bin Shu'ayb.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7728