Verily, Allah likes three things for you and disapproves three things for you.
Abu Hurairah (May Allah be pleased with him) said:
The Messenger of Allah ( may the peace and blessings of Allah be upon him ) said, "Verily, Allah likes three things for you and disapproves three things for you. He likes that you should worship Him Alone, not to associate anything with Him (in worship) and to hold fast to the Rope of Allah and not to be divided among yourselves; and He disapproves for you irrelevant talk, persistent questioning and the wasting of the wealth."
[Muslim]
To say that Allah the Almighty likes or disapproves this refers to the command or the prohibition and the reward or the punishment, as if he says: Do so, it pleases me and I will reward you for it, but do not do so for it angers me and I will punish for it.
The Messenger of Allah ( may the peace and blessings of Allah be upon him ) said: " Verily, Allah likes three things for you ". this is in particular since Allah likes what guarantees happiness for us in this world and in the Hereafter. There are numerous examples of this fact. Since Faith is composed of seventy-seven branches under each one there are uncountable good qualities.
The first thing of these three: is to worship Allah the Almighty alone, that is to obey his commands and to avoid what he prohibited, to surrender to him, and to express the need to him in all cases.
The second thing is not to associate anyone or anything with him in worship, so that the slave worships his Lord sincerely, seeking nothing but his contentment.
The third thing: to holdfast to the rope of Allah - the Almighty - that is to adhere to his Holy book and the Sunnah of his Prophet may the peace and blessings of Allah be upon him.
Islamic unity is a long and arduous road, but it is inevitable for the upright life and the salvation.
Working to realize the Islamic unity is an ancient honor if it is accompanied by believing in Allah, relying on his bounty, a positive response to the Qur'an and the Sunnah, full awareness of the requirements and of the modern time and understanding the real pros and cons of life.
He who is heedless of the mention of Allah preoccupies himself by tracking the defects of people, backbiting and criticizing them all of this is done by the foolish people.
The best people are those who leave what is not useful in terms of religious and worldly affairs; because the attachment to it is a kind of foolishness.
The best people are those who spend generously and abstain from looking to the preoperties of other people, their questions are limited to what is useful.
In summary, the pure Tawheed is the origin, and that the Muslims will not achieve their unity unless they gathered on the Book of Allah and the Sunnah of His Messenger, may the peace and blessings of Allah be upon him, and worked to achieve what benefits them in their religion and in their worldly affairs.