It is reported from Ubaydullah (may Allah have mercy on him) likewise, except that he did not say: "from the spoils (nafl)."
Some narrators erred in it and narrated from Abu Usamah and Ibn Numayr, from Ubaydullah: "and one share for the man on foot." The correct version is the narration of the majority from these two and from others, from Ubaydullah, as we have mentioned. Sufyan al-Thawri, who is an imam, and Abu Mu'awiyah al-Darir, who is one of the hadith masters (huffaz), narrated it from Ubaydullah with the explanation.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12865