Moreover...
Moreover, the Prophet used to invite the attention of the people to the attributes and virtues which had concentrated in the personality of Ali so that they might know that he was the best person to carry on the lslamic mission after him.
Some instances have been quoted in authentic traditions, which go to show that the natural conditions also helped in creating harmony between Muhammad and Ali, and shaped the events and the environments in such a way that Ali displayed the attributes which were not shared with him by any one.
One of those attributes was that he was born in the Ka'bah, which is the “Qibla” of the Muslims and his birth took place at a time when the Islamic call was about to be given by Muhammad and he had not made it public. In those days he resided in the house of Ali's father Abu Talib. When Ali opened his eyes he saw Muhammad and Khadijah offering prayers. He was the first man who expressed faith in Muhammad although he was not yet fully grown up.
When the people reproved him for embracing Islam without the permission of his father he replied at once: “God created me without seeking Abu Talib's agreement. Then why should I obtain my father's permission to worship God”. For quite a long time the religion of Islam remained confined in the house of Muhammad and there were then only four Muslims in the world: namely, Muhammad, his wife Khadijah, his cousin Ali and his slave Zaid bin Harith.
On the day when Muhammad invited his kinsmen to a feast and wished to address them and communicate the message of Islam to them, his uncle Abu Lahab interrupted him and incited those present against him. Consequently all of them stood up and left Muhammad's house. The Prophet invited them once again and said after meals were over: “I do not know any person in Arabia who may have brought a present which is better than the one which I have brought for you.
Who from amongst you will help me?” The persons present declined to commit themselves and wanted to leave the house as before, but in the meantime Ali, who was still a boy and had not attained the age of manhood stood up and said: “O Prophet of God! I shall assist you and shall fight against anyone who opposes you”. Members of Bani Hashim family laughed out and then went away ridiculing Abu Talib and Ali. In every battle Ali was the standard-bearer of the Prophet.
He dedicated his valour, blood, heart, tongue and his very life for his cousin, the Prophet, and for the success and victory of Islam.