Pronouncing the testimony of faith is sufficient to make one to revert to Islām. 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)
Knowledge (al-ilm) of its meaning, what it negates and affirms. If a person says it without knowing its meaning, nor what its requirements are, then he will not benefit by it, because he has not believed in what it requires. Rather, he is like someone who speaks in a language that he does not understand.
2 Certainty (Al-Yaqeen)
The heart must be firmly certain of the meaning of Shahadah without a blemish of doubt.
Allāh the Exalted says: “Verily, the believers are only those who truly believe in Allāh and His Messenger, and then doubt not.” (Qur’ān 49:15).
The Messenger of Allāh , peace be upon him, said: “I bear witness that there is no god but Allāh , and I am the Messenger of Allāh . No slave meets Allāh with this testimony, having no doubt in it but shall enter Jannah.”( Muslim) :
3 Sincerity (Al-Ikhlaas)
Exclusively worshiping Allāh , which is contrary to shirk. This is what laa ilaaha illAllāh points towards.
Allāh , the Exalted, said: “And they were not commanded but to worship Allāh , being sincere in devoting religion to Him.” (Qur’aan 98:5).
Abu Hurairah said: “I asked the Messenger of Allāh , peace be upon him: Messenger of Allāh ! Who will be most fortunate to enjoy your shafa’ah (intercession) on the Day of Resurrection? The Messenger of Allāh , 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 Allāh ) “None has the right to be worshiped except Allāh “, sincerely from his heart..”(Musnad al-Imam Ahmad.)
4 Truthfulness (As-Sidq)
Truthfulness (as-sidq), which prevents hypocrisy (nifaaq). Indeed, the hypocrites uttered it with their tongues, but did not inwardly believe in what it signified.
The Messenger of Allāh said: “Anyone testifies that there is no god but Allāh and Muhammad is the Messenger of Allāh , truthfully from his heart, Allāh would forbid his admittance to the Fire.”(Muslim)
5 Love and affection (Al-Mahabbah )
Love (al-mahabbah) for this kalimah and having love and pleasure for whatever it necessitates. This is contrary to the [state of the] hypocrites.
The Messenger of Allāh , peace be upon him, said: “There are three (qualities), whoever possesses them, will taste the sweetness of Iman (belief): to love Allāh and His Messenger more than anyone else, to love the Muslim only for the sake of Allāh , and to dread returning to kufr (apostasy) as he dreads being thrown in fire.” ( Bukhari and Muslim.)
Allāh says to His Messenger (peace be upon him)
Say (O Muhammad SAW to mankind): “If you (really) love Allāh then follow me (i.e. accept Islāmic Monotheism, follow the Qur’aan and the Sunnah), Allāh will love you and forgive you of your sins. And Allāh is Oft-Forgiving, Most Merciful.” (3:31)
Allāh says: “Allāh shall bring forth a people whom He loves and they love Him.”(Qur’aan 5:54)
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
Submissive compliance (al-inqiyaad), by fulfilling its rights – which are the obligatory actions – with sincerity to Allāh and seeking His good pleasure. This is its requirement. Allāh , the Exalted, says: “And he who submits himself to Allāh , and does good, he has surely grasped a strong handle.” ( Qur’aan 31:22).
Allāh also says: “And turn you to your Rabb, and submit yourselves to Him.”(:Qur’aan 39:54).
7 Acceptance and conformity (Al-Qubool)
Acceptance (al-qabool), which prevents rejection.
This is achieved by acting upon what Allāh has commanded and abandoning whatever He has prohibited.
Abu Musa al-Ash’aree reported that the Prophet, peace be upon him said: “The parable of guidance and knowledge which Allāh 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 Allāh 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 Allāh and benefited from the Message with which Allāh has sent me, whereby he learns and taught others. The other person turned away from it (from my Message), and rejected the guidance of Allāh with which I am sent..” Bukhari and Muslim.)
Allāh says “Indeed in the Messenger of Allāh (Muhammad peace be upon him) you have a good example to follow for him who hopes in (the Meeting with) Allāh and the Last Day and remembers Allāh much.”(33:21)
And Allāh 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 Allāh . Verily, Allāh is Severe in punishment. (59:7)
Again Allāh says:
O you who believe! Obey Allāh 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 Allāh and His Messenger ( peace be upon him), if you believe in Allāh and in the Last Day. That is better and more suitable for final determination.(4:59)
And Allāh 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 Allāh again tells his Messenger
Say (O Muhammad peace be upon him): “Obey Allāh and the Messenger (Muhammad peace be upon him).” But if they turn away, then Allāh does not like the disbeliever’s” (3:32)
Islām unites together people of different colours, languages, races. and nationalities into one brotherhood.
Allāh says: “Indeed the Believers are but brothers.” [Qur’aan 4 9:10]
Before Islām people in Arabia were dived into different tribes. Some of them were at constant war with each other, Islām came and Allāh put peace and love in their hearts for each other.
Allāh the Most High said: “And remember the favor of Allāh upon you, for you were once enemies to one another but He joined your hearts together in love, so that by His Grace you became brothers.” [Soorah Aal-Imraan 3:103]
And Allāh the Most High said: “He it is that has strengthened you with His help and with the Believers. And moreover, He has united their hearts with love and affection. If you had spent all that is in the earth, you could not have united their hearts with love and affection. However, Allāh has united them. Indeed Allāh is the All-Mighty, All-Wise.” [Soorah al-Anfaal 8:62- 63].
Allāh has stated in the Holy Qur’aan:
“… whoever disbelieves in false deities and believes in Allāh , hath grasped the most trustworthy handhold, that will never break…” (2:256)