It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that I asked: Is there (a share) of it for those who work on it (the collectors)? He said: Yes, according to the extent of their work.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الصدقات / 13170