The Messenger informed Mu'adh bin Jabal, when he was going to the land of Yemen,
"You are going to a people from the People of the Book. Let the first thing that you call them to be the worship of Allaah. If they acknowledge Allaah, then inform them that Allaah has obligated upon them five prayers during their days and nights."
This hadith is clear. It does not require much of an explanation. The Prophet applied this principle in his practical calling to Islam.
He stayed in Makkah for thirteen years to teach the people eemaan and to educate his Companions on this point and to correct the beliefs of the people. That is the pattern upon which the Companions were brought up.
Jundub Ibn Abdullaah al-Bajaly said, "We learned eemaan (faith) and then we learned the Qur'aan and it increased our eemaan."
Abdullaah ibn Umar said, "We lived during an instant of time in which one of us would receive faith first before receiving the Qur'aan and when the surahs were revealed we would learn what they permitted and what they prohibited and what they forbade and what they ordered and what should be the stance towards them.
But I have seen many men from whom one is given the Qur'aan before eemaan and he reads it from the opening of the Book to its closing and he does not know what it orders and what it forbids and what should be his stance towards it. He is like someone who is just throwing out dates [i.e., he does not get any benefit from his recital]."
That is the manner in which the Prophet brought up his companions:
Eemaan first and then the Qur'aan.
The beliefs must be corrected first, then follows all of the other aspects of the religion.
And Imaam ash-Shafi'ee said, "That a servant meets allaah with every sin except Shirk is better say than meeting Him upon any of the innovated beliefs."
"And as for those whom your right hands have made a covenant (Ar.,aqadat)" [al-Nisa 33]. And Allaah also says,
"But He will take you to task for the oaths which you swear in earnest (Ar., aqadtum)" [al-Maida, 89] which means asserted and adhered to, as proven in the verse,
"And break not oaths after the assertion of them" [an-Nahl, 91].
Therefore, al-aqidah or al-itiqad according to the scholars of Islam is: The firm creed that one's heart is fixed upon without any wavering or doubt. It excludes any supposition, doubt or suspicion.
But what is the name the Qur'aan gives to this matter?
The Qur'aan gives the grave matter the name eemaan.
Allaah says in the Qur'aan,
"And thus We inspired in You (Muhammad) a Spirit of Our command. You did not know what the Scripture was, nor what the Faith was. But we have made it a light whereby We guide whom We will of our bondmen..." [al-Shura, 52].
The general concepts that the heart of the believer must be firm about are the "pillars" of this faith. But one will not be called a believer just by knowing and understanding these pillars but he must come to the level where he submits and implements what is described, in the hadith of Gabriel, as Islam. Eemaan, in this manner, incorporates Islam.
If eemaan was simply knowing the facts in one's heart, then its companion would be equal to Satan and Pharaoh [Note: The Satan was the most knowledgeable of his Lord but he was destroyed because of his pride and envy. And Pharaoh, even though he claimed to be the lord, knew that the lord is Allaah and that none has the right to be worshipped but Him. Allaah says,
"He said: In truth you know that none sent down these portents save the Lord of the heavens and the earth as proofs..." [al-Isra, 102]. - Although they knew the truth, they did not put it in practice by turning their 'ibadah to Allaah Alone].
In the hadith of Gabriel, the Prophet explained the pillars of this faith in which every human must believe, when he was asked, "What is eemaan?", he said, "To believe in Allaah and His angels and His books and His messengers and the Last Day and predestination of good and evil."
It is a must for every person to know these pillars and to learn them with a correct understanding and to believe in them in the manner that he pious forefathers understood and believed in them,
in the same manner that the Companions of the Prophet believed and understood them, as well as their Followers and those who followed on their path.
And Shaikh al-Islam al-Haruwi al-Ansari (d. 481 AH) stated at the beginning of his book, Itiqad ahl al-Sunnah, "The first obligation upon the slave is the knowledge of Allaah. This is proven by the hadith of Muadh, when the Prophet said to him, 'You will come to a people from the People of the Book. The first thing that you should call them to is the worship of Allaah. If they gain the knowledge of Allaah, then tell them that Allaah obligates upon them five prayers during the day and night...' "
From this premise did the great scholars of Islam precede. Ponder, for example, what Imaam Muhammad ibn Ismail al-Bukhaaree did in his book al-Jami al-Sahih, which is the most authentic book after the Book of Allaah; one will see that from his detailed knowledge and understanding of this religion, this great Imaam began his book with "The Beginning of Revelation" and then he followed it with chapters on faith, followed by the chapters on knowledge. As if he means, may Allaah have mercy on him, to point out that the first obligation upon a human being is faith or Eemaan and the way to attaining faith is knowledge. And the source of faith and knowledge is revelation. So he began by showing how the revelation occurred and what it was like. Then he followed by mentioning faith and knowledge. This arrangement is no accident; by it he makes some important points.
This is the sum of what we wish to mention and what we wish to raise our voices about. The matter of aqeedah is the first priority. Faith and knowledge are the means of attaining it. And the source of knowledge and faith is the Book and Sunnah.
[ This content is taken from http://www.sunnahonline.com/main.htm which allows others to place it on other websites for dawah purposes]