This (report) is also narrated as the saying of Amr bin Shu'ayb himself; Abd al-Wahhab did not mention the withholding of his share.
It is said that this Zuhayr is majhul (unknown), and he is not (Zuhayr bin Muhammad) al-Makki.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18212