The prophet and his blessed companions' lives were full of happiness, prosperity of minds and hearts, good relations, perfect dealings and good manners enabled them, in a very short time, to dominate the world and control peoples and nations everywhere after they were the poorest and the weakest people, but in a very short time they reached their goals.
The secret is following Koran, our good ancestors made the Koran a living book among them, the book of their lives, they never move unless they take permission from Koran. If someone wants to do something for himself, his wife, his son or his society, he refers back to Koran, he reads it once or twice until he knows the fact and the secret of his deed, if the Koran allows it, he hastily does it, and if the Koran prohibits, he hastily leaves it. They made the Koran their imam and their constitution that rules everything in this life. They didn't need manmade or earthly decrees to control them.
When Abu-Bakr appointed only one judge for all Muslims, not a service or official quarters or group of counselors, but only one judge for all Muslims, he chose our sir Omar Ibn Al-Khat'tab about whom the prophet said:
This judge remained at his work for a year without a single case. The caliph wanted to give him his salary for the year, but Omar refused and said to Abu-Bakr: "People who believed in Allah, followed their prophet and made the Koran the judge among them, never need a judge to judge them." Because the judge is Allah and the dominant is the book of Allah.
When a man of them heard a verse from the book of Allah recited, he stops and says to himself: "This is the book of my Lord in which He never strays or forgets." He followed the book of Allah because it is the rescuer from all diseases, the cure for every illness and the assured healing for all problems. The prophet said:
"There will be temptation." They asked: "What is the way out O messenger of Allah?" He said: "The book of Allah, it has the news of people who proceeded you and people who will follow you and the judgments of what is amongst you, it is the unmistakable judgment not drollery or jesting, if an arrogant leaves it, Allah will shatter him, whoever seeks guidance away from it Allah strays him, it is the strong Rope of Allah, the wise remembrance and the straightway, lusts never deviate by it, tongues never be ambiguous by it, scholars never be satiated by it, it never wears out because of replying and there is no end to its marvels, when Jinn heard it they said: (Verily! we have heard a wonderful Recital (this Koran!) It guides to the Right Path, and we have believed therein.), whoever says it, he is truthful, whoever follows it, he will get rewards, whoever judges by it, he is fair and whoever calls for it, he will be guided to the straight way."
All the companions knew these meanings and made them their examples, our sir Abdullah Ibn Masood expressed this fact, he said: "We made the book of our God, messages from Allah to us, so we read and contemplated it at night then we do and fulfill it at day." I.e. fulfill what Allah orders in Koran. If He said forgive, he forgives, if He said overlook (mistakes), he overlooks and if He said listen to so and so, he listens. He fulfills the Koran literally, every one of them was a Koran walking among people following their.
You know when the prophet was gifted a doctor, he sent him back, because they followed the book of Allah and discovered the medicines that cures the diseases of man from the nearby medical plants, so they didn't need a doctor. Mrs. A'isha learned medicine from wise people who came to visit the messenger of Allah and prescribed medicines to him. When the prophet migrated from Mecca to Medina, they applied the instructions of the book of Allah all over their political, religious and social life. The result was that they made for mankind a perfect example for utopia (the virtuous city) and the fair state. This is the dream and the aim of mankind at every time.
 Ibn Adey AlKendey Sonan Abi Dawood WalBayhaky AlKobra.