It is narrated from Hisham (as above). It may be that by this precedence is meant the steadfastness of al-Zubayr (may Allah be pleased with him), together with a group of the Companions of the Prophet (peace and blessings be upon him), alongside the Prophet (peace and blessings be upon him) on the day of Uhud, and their pledging allegiance to him (peace and blessings be upon him) unto death.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 13086