However, it would not be sufficient for anyone to only utter this testimony orally either in private or in public; but rather, he should believe in it with a firm conviction and unshakeable faith. If one is truly sincere and complies with the teachings of Islam in all his life, he will find himself a new born person
Pronouncing the testimony of faith is sufficient to make one a convert to Islam. There are however, seven conditions that must be observed before it can effectively make one a Muslim. These are describe as follows:
1 Knowledge (Al-ilm)
2 Certainty (Al-Yaqeen)
The heart must be firmly certain of the meaning of shahadah without a blemish of doubt.
3 Sincerity (Al-Ikhlaas)
Allah, the Exalted, said:" And they were not commanded but to worship Allah, being sincere in devoting religion to Him." (Qur'an 98:5).
Abu Hurairah said:" I asked the Messenger of Allah, peace be upon him: Messenger of Allah! Who will be most fortunate to enjoy your shafa'ah (intercession) on the Day of Resurrection? The Messenger of Allah, peace be upon him, said: I was certain that no one else would ask me about this other than you, because I have noticed your keenness for hadeeth. The most fortunate of men who will enjoy my shafa'ah on the Day of Resurrection is the one who says: (La Ilaha Illa Allah) "None has the right to be worshipped except Allah", sincerely from his heart.."(Musnad al-Imam Ahmad.)
4 Truthfulness (As-Sidq)
The Messenger of Allah said: "Anyone testifies that there is no god but Allah and Muhammad is the Messenger of Allah, truthfully from his heart, Allah would forbid his admittance to the Fire."(Muslim)
5 Love and affection (Al-Mahabbah )
The Messenger of Allah, peace be upon him, said: "There are three (qualities), whoever possesses them, will taste the sweetness of Iman (belief): to love Allah and His Messenger more than anyone else, to love the Muslim only for the sake of Allah, and to dread returning to kufr (apostasy) as he dreads being thrown in fire." ( Bukhari and Muslim.)
Say (O Muhammad SAW to mankind): "If you (really) love Allah then follow me (i.e. accept Islamic Monotheism, follow the Quran and the Sunnah), Allah will love you and forgive you of your sins. And Allah is Oft-Forgiving, Most Merciful." (3:31)
The Prophet, peace be upon him, also said: "None of you shall (really) believe until I become dearer to him than his own father, and son and all mankind." ( Bukhari and Muslim.)
6 Submission (Al-Inqiyaad) internally and externally
Allah, the Exalted, says: "And he who submits himself to Allah, and does good, he has surely grasped a strong handle." ( Qur'an 31:22).
Allah also says:" And turn you to your Rabb, and submit yourselves to Him." (:Qur'an 39:54).
7 Acceptance and conformity (Al-Qubool )
Abu Musa al-Ash'aree reported that the Prophet, peace be upon him said: "The parable of guidance and knowledge which Allah has sent me with is like a rain which fell on a land. A patch of that land received the water and produced much herbage and grass. And a patch which was barren. The latter retained water wherewith Allah extended benefits to men: they drank from it, irrigated and planted their vegetation. And a patch which was a sandy plain, it neither retained water nor produced herbage. This is parallel to the person who conceived the religion of Allah and benefited from the Message with which Allah has sent me, whereby he learnt and taught others. The other person turned away from it (from my Message), and rejected the guidance of Allah with which I am sent.." Bukhari and Muslim.)
And Allah also says in Surah Al-Hashr
....And whatsoever the Messenger (Muhammad peace be upon him) gives you, take it, and whatsoever he forbids you, abstain (from it) , and fear Allah. Verily, Allah is Severe in punishment. (59:7)
Again Allah says:
O you who believe! Obey Allah and obey the Messenger (Muhammad peace be upon him), and those of you (Muslims) who are in authority. (And) if you differ in anything amongst yourselves, refer it to Allah and His Messenger ( peace be upon him), if you believe in Allah and in the Last Day. That is better and more suitable for final determination.(4:59)
And Allah says:
But no, by your Lord, they can have no Faith, until they make you (O Muhammad ) judge in all disputes between them, and find in themselves no resistance against your decisions, and accept (them) with full submission.
In the next verse Allah again tells his Messenger
Say (O Muhammad peace be upon him): "Obey Allah and the Messenger (Muhammad peace be upon him)." But if they turn away, then Allah does not like the disbeliever's (3:32)