Zakah collectors and what they receive from it

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.

Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "When a worker is appointed as an official, and he takes what is due and gives what is due, he continues to be like one who strives (does jihad) in the path of Allah until he returns to his home."
Al-Tabarani recorded it in al-Mu'jam al-Kabir. Its chain contains a narrator, Dhu'ayb bin Imamah. Al-Dhahabi says: Al-Daraqutni (may Allah have mercy on him) and others declared him da'if (weak), but he was not discarded altogether.

Sayyiduna Adi bin Hatim (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) sent him as a zakah collector to his people. When he had collected the zakah from them, it was at that time that the Prophet (peace and blessings be upon him) passed away.
Al-Tabarani recorded it in al-Mu'jam al-Kabir. Its chain contains a narrator, Dawud bin al-Zibriqan, who is da'if (weak).

Sayyiduna Uqbah bin Amir (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) sent me as a zakah collector. I asked his permission to eat from the zakah, and he gave me permission.
Ahmad recorded it, and its chain contains a narrator who is not named.

Sayyiduna Salamah al-Hamdani (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) wrote a letter to Qays bin Malik al-Arhabi: "O Allah, seeking blessing through Your name (I begin). This is from Sayyiduna Muhammad (peace and blessings be upon him), the Messenger of Allah, to Qays bin Malik. Peace be upon you, and may the mercy of Allah Almighty, His blessings and His forgiveness descend. To proceed: I appoint you as an official over your people, over their desert-dwellers and their town-dwellers, over their freed clients and their dependents. And I grant you two hundred sa' of the grain of Yasar (this is the name of a mountain in Yemen) and two hundred sa' of the raisins of Khaywan (this is a city in Yemen) (that is, I fix this as your stipend), and this will remain for you and for your descendants after you forever and ever." Qays says: This saying of the Prophet (peace and blessings be upon him), "forever and ever," is the most beloved thing to me; now I hope that my descendants will remain forever and ever. The narrator Yahya says: "Urbuhum" means the desert-dwellers, and "Khumuruhum" means the town-dwellers, that is, the people living in the settlements.
Abu Ya'la recorded it. Its chain contains a narrator, Amr bin Yahya bin Salamah, who is da'if (weak).