and Allah said "And proclaim the pilgramage among men; they will come to thee on foot and on every kind of camel. Lean on account of Journeys through deep and distant mountain highways" Surah 22 ~ Al Hajj Part 27
During the tenth year of the hijrah, as in the preceding one, numerous emissaries continued to pour into Medina from all parts of Arabia , to testify to the allegiance of their chiefs and their tribes. Teachers were sent by the Prophet into the different provinces to teach the new converts the principles and precepts of Islam. These teachers were invariably given the following injunctions when they were about to depart on their mission: "Deal gently with the people, and be not harsh; cheer them, and do not look down upon them with contempt. You will meet with many believers in the Holy Scriptures, who will ask you: 'What is the key to heaven?' Answer them it (the key to heaven) is to bear witness to the divine truth and to do good."
Thus, the mission of the Prophet Muhammad was now accomplished; the whole work was achieved in his lifetime. Idolatry with its nameless abominations was entirely destroyed. The people who were sunk in superstition, cruelty, and vice in regions where spiritual life was utterly unknown were now united in one bond of faith, hope and charity. The tribes which had been from time immemorial engaged in perpetual wars were now united together by the ties of brotherhood, love, and harmony. Henceforth, their aims were not confined to this earth alone; but there was something beyond the grave - much higher, purer, and diviner - calling them to the practice of charity, goodness, justice, and universal love. They could now perceive that Allah was not that which they had carved out of wood or stone, but the Almighty Loving, Merciful, the Creator of the Universe.
On the return of the sacred month of pilgrimage, the Prophet, under the presentiment of his approaching end, determined to make a farewell pilgrimage to Mecca . In February 632, he left Medina with a very considerable concourse of Muslims. It is stated that from ninety thousand to one hundred and forty thousand people accompanied the Prophet. Before completing all rites of the pilgrimage, he addressed the assembled multitude from the top of Mount Arafat in the following words:
"O people! Listen to my words, for I know not whether another year will be vouchsafed to me after this year to find myself among you. Your lives and property are sacred and inviolable among one another until you appear before the Lord, as this day and this month are sacred for all; and remember, you will have to appear before your Lord Who will demand from you an account for all your actions. O people, you have rights over your wives, and your wives have a right over you. Verily you have taken them on the security of Allah and have made their people lawful unto you by the words of Allah. And your slaves, see that you feed them with such food as you eat yourselves, and clothe them with the stuff you wear, and if they commit a fault which you are not inclined to forgive, then part with them; for they are the servants of the Lord and are not to be harshly treated. O people, listen to my words and understand them. Know that all Muslims are brothers. You are one brotherhood; but no man shall take ought from his brother, unless by his free consent. Keep yourselves from injustice. Let him who is present tell this to him who is absent. It maybe that he who is told this afterward may remember better than he who has now heard it.
The Prophet concluded his sermon by exclaiming: "O Lord, I have fulfilled my message and accomplished my work." The assembled multitude, all in one voice, cried: "Yea, verily you have." The Prophet again exclaimed: "O Lord, I beseech You, bear witness to it."
Having rigorously performed all the ceremonies of the pilgrimage, that his example might be followed by all Muslims for all succeeding ages, the Prophet returned with his followers to Medina .
The eleventh year of the hijrah, being the last year of Muhammad's life, was spent at Medina . There he settled the organisation of the provincial and tribal communities which had adopted Islam and become the component parts of the Muslims federation. More officers had to be deputed to the interior provinces for the purpose of teaching their inhabitants the precepts of the religion, administering justice, and collecting Zakat. Mu'adh Ibn Jabal was sent to Yemen . On his departure to that distant province the Prophet enjoined him to use his own discretion in the event of his being unable to find express authority in the Quran. Ali was deputed to Yamama in the southeast of the peninsula. To him the Prophet said: "Never decide between any two parties who come to you for justice unless you first hear both of them."
A force was not being prepared under Osama, Ibn Zaid, whose father was killed at Muta, against the Byzantines, to exact the long-delayed reparation for the murder of the envoy to Syria . However, the news of the Prophet's sickness and failing health caused that expedition to be stopped. This news was soon noised abroad and produced disorder in some districts. Three pretenders had arisen who gave themselves out as prophets and tried by all kinds of imposture to win over their tribes. The most dangerous of these pretenders was known as Al Aswad. He was a chief of Yemen and a conjurer. He soon succeeded in gaining over his tribesmen and, with the help, reduced to subjection many of the neighboring towns. He killed Shahr, whom the Prophet had appointed as Governor of Sana in the place of his father Bazan, who had just died. Bazan had been the viceroy of Yemen under Chosroes of Persia; after he had adopted Islam he was allowed by the Prophet to remain as Governor of Yemen. He was able to convert to Islam all the Persian colony in that province. Al-Aswad, the conjurer, had now killed Shahr, but soon after he was massacred by the Persians of Yemen.