So that the governor and the subjects may distinguish the camels of charity from others, in order to distribute them to those entitled to the shares of charity and not to others, if the report is authentic.

Hazrat Akraash bin Dhuyayb narrates that the people of Banu Murrah bin Ubaid gave me their zakat and sent me to the Messenger of Allah (peace be upon him). So I came to you in Madinah Munawwarah. I found you sitting among the Muhajireen and Ansar companions. I had brought such camels to you as if they were the red fruits (or roots) of the Arti tree. The Prophet (peace be upon him) asked: "Who are you?" I replied, Akraash bin Dhuyayb. The Prophet (peace be upon him) said: "State your noble lineage." I said: Ibn Harqoos ibn Khurah ibn Amr ibn Nazzal ibn Murrah ibn Ubaid, and this is the zakat of Banu Murrah bin Ubaid. So the Messenger of Allah (peace be upon him) smiled and then said: "These are the camels of my people. This is the zakat of my people." Then he ordered that these camels be marked with the sign of zakat camels and included among the zakat camels. Then the Prophet (peace be upon him) took my hand and took me to the house of Sayyidah Umm Salamah (may Allah be pleased with her). Then the complete hadith was narrated.