Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) narrates: I heard the Prophet (peace and blessings be upon him) say: "One who works at collecting zakah with justice for the sake of the pleasure of Allah Almighty is like one who fights in the path of Allah, until he returns home."
Ahmad recorded it. Its chain contains a narrator, Ibn Ishaq, who is thiqah (trustworthy) but a mudallis (one who practises tadlis), and the rest of its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الزكاة / 4449