To enter into the fold of Islam, one must do so with the pronunciation of this testimony (Shahadah), with sincere belief and conviction. Once one has entered into the fold of Islam all past sins are forgiven. From a thereafter one must try to live his life in piety and rightfully. In a Hadith, The Messenger of Allah (pbuh), said to a person who wished to enter Islam: "Do you not know that accepting Islam, forgives all sins which come before it?".[Muslim]
Allah states "The only religion in the sight of Allah is Islam." [3:19] and in another verse he states "If anyone desires a religion other than Islam, never will it be accepted of him; and in the Hereafter, he will be in the ranks of those who have lost." [3:85]
The proclamation of Islam is done by stating the following with faith and understanding.
" Ashhadu anna Laa ilaaha illaa Allah, wa anna Muhammadan rasulu Allah."
"I testify that there is no true god [deity] but Allah, and Muhammad is the Messenger and servant of Allah."
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