Guidelines to rulers

Reporting Imam al-Sadiq (a.s), `Abd al-Rahman ibn Sulayman says: Amir al-Mu’minin sent a man to the desert of Kufah to collect alms, saying:
O servant of Allah! Fear Allah and do not prefer the world to the Hereafter. Be careful about what I have trusted you. Guard Allah’s right until you reach such and such tribe. Place yourself in their region with out residing near their houses. Then proceed towards them solemnly so as to be among them. Greet them and say: O servants of Allah! The friend of Allah has sent men to you to receive what is due to Allah from you. Is there anything due to Allah in your property to pay to the friend of Allah? If anyone them of answers negatively, say no more. If a rich man answers affirmatively, go with him, without intimidating him. Do not promise (of anything) but good to him until you reach his camels and cattle. Do not go among them unless you are given permission, for most of them belong to him. Say to him: O servant of Allah! Will you permit me to go among them? If he says yes, do not go among the camels and the cattle like a rough man who has an upper hand. Divide them into two halves. Then let him choose the one he likes. Do not protest him for his choice. Divide the  remaining into two. Keep on this division until what is due to Allah will remain and then collect it. If he asks you to cancel the division, accept it. Mix them altogether and so the same as you have done before until you collect of the camels and cattle what is due to god. Then take for yourself an agent who is benevolent, Muslim, sympathetic, trustworthy and a safe keeper who does not treat them roughly. Therefore send to me immediately whatever you collect of each of the tribes to be put in a place Allah has commanded. If your emissary brings them here, advise him not to hide the young camel from its mother, nor milk it fully so as to harm the young camel, nor tire it by riding but to ride them equally, to take them to a place to drink water, not to push them from pasture to the plain road when they are having rest and at times it is hard for them, to make use of them softly so that Allah willing, they will come to us fat and fleshy, not tired out or exhausted so that they will be divided according to the Book of Allah and the tradition of Allah’s Messenger.
This attitude will make your reward greater and is closer to your interest. Allah will look at them, you, your endeavor and sympathy with the one who has sent you and the ones who need the alms.
Allah’s Messenger has said: Allah favors an agent who does his best to obey his leader with sympathy. Al-Gharat: 75/1.)