Prophet Mohammad (saws) taught the principles of universal brotherhood. This is very much visible in the mosques, when the worshippers are gathered on the call of mauzzan for offering prayers. A peasant and a king ( VIP ) kneel side by side and proclaim , "Allah alone is Great. "
The wonderful values of unity and uniformity can be seen every year during the Hajj. Arabs, Europeans, Africans, Iranians, Indonesians, Turkish, Chinese and people from the subcontinent all meet together in Mecca as members of one family. Men are clad in one dress, plain white cloth, one piece wrapped around lower half of the body and another over the shoulder, bare head without pomp and show. It is impossible to differentiate between a king and a peasant. Women are dressed covered from head to foot in a most simple way. Every one has the same words on their tongue :
"Here I am, O Allah , at your Command! Here I am at your Command! You are without associate; Here I am at your Command! All praise for you and grace and dominion! You are without associate."
The prophet of Islam introduced a solid system of Justice, where the Judge (Qazi) enjoys supremacy over a king. For instance, some of the Caliphs had to appear before the Judge as ordinary men in Islamic courts.
We all are fully aware , how the black Negroes are treated by the white races. Hazrat BILAL was a Negro Slave in the days of Prophet Mohammad (saws). He was given responsibility to call for prayer from the Mosque of the Prophet at Medina. Hazrat Omar, the second Caliph, had very high respect for Hazrat Bilal and whenever he saw him, as a mark of respect he always welcomed him with "Here come our master". What a tremendous amount of respect was given to a Negro slave. This change was brought about by the Prophet with the help of Quran. This is also the reason why George Bernard Shaw said :
"If any religion has a chance of ruling over England or Europe within the next 100 years, it will be Islam".
Prophet Mohammad (saws) had established a very organized system of charity known as Zakat. He had then,by the grace of the Almighty , made illegal all anti-social practices like monopoly, usury, creating an artificial scarcity of any commodity , gambling and intoxication. On the contrary , he had promoted construction of places of worship, digging of wells and opening of orphanages . It is evident that by way of following such practices there is a direct influence on the economic system . He had therefore brought new system , a new life, a new culture, a new civilization. The same culture was later established in the three continents -- Asia, Africa and Europe.
In his personal life ,the Holy Prophet used to patch his own clothes, repair his sandals, milk his ewe (female sheep), eat with the slaves, sit on the ground, ride a donkey, and carry someone with him; he would not be ashamed to carry his own groceries and other items from the market to his family. He would shake hands with the rich and the poor alike and he would not take his hand back from the hand of the other person until that person himself withdrew his hand. He would salute anyone who came to him ,whether rich or poor, old or young. He would never look down on what he was offered even if it were a dry date. He was kind by nature and merciful to every Muslim.
It should be noted that the influence of his qualities like the honesty, the best behaviour, the sincerity and trustworthiness was so great on the followers that even getting a brutal treatment by the nonbelievers in Mecca they did not go back to their old faith and did not turn away from Islam.
One year after the Battle of Trench , the Prophet and approximately One thousand of his companions left for Makkah to perform the annual pilgrimage (628 AD).When they reached Hudaibiyah (a place near Mecca) they were denied entry by the citizens of Mecca ;later ,they returned back after signing a treaty.
After the Prophet came back from Hudabiyah , letters were sent to several Kings and the Rulers inviting them to accept Islam. Within two years , many rulers and large number of Arabs accepted Islam.
When the Quraish violated the Hudaibiyah treaty ,the Prophet decided to march towards Makkah with an army of ten thousand Muslims. This was done at the end of 630 AD.When they entered Mecca there was no resistance and subsequently Mecca was conquered .
Finest example of his forgiving nature was exhibited in the town. This was the city which had refused to listen to his mission, and the people had tortured him and his followers to the extent that he and his followers were driven into exile .Now that city , lay at his feet . On that occasion he stood at the zenith of his power. The laws of war allows for revenge and some of his companions were also ready to inflict the blows , but Mohammad's (saws) heart flowed with affection and love . Standing on one of the steps of the Holy Kaa`ba , HE DECLARED : This day, you are all free." The city had witnessed that he had pardoned all his enemies , even those who killed his beloved uncle HAMZA were also pardoned. This was the personality of PROPHET MOHAMMAD (SAWS)
Before the death of the Prophet ,several thousand had accepted Islam.They were practicing Islam as per the advice of the Prophet and found to be very sincere. Among them ,very close followers are ;
Hazrate Abu Bakr,Umar,Usman,Ali,Talha,Zubair,Zaid bin Haaris,Abdur Rahaman bin Auf, Sa`ad bin Wiqas,Sa`ad bin Zaid,Abu Ubaidah,Abu Hraira , Hamzah,Abbas , Hasan and Husain , many women and several others. Carrying the message of Islam was their greatest responsibility and it was successfully done by them. Within ninety years, the light of Islam had reached Spain , North Africa ,North west China and India.
There is no compulsion in religion ,is well known principle of Islam .