The Shahada — the doorway
The Shahada is what brings a person into Islam. You say it with your tongue and affirm it in your heart. There is no ritual and no required place, and no one needs to be present — though saying it before two Muslim witnesses is better so it can be documented.
What you say
أَشْهَدُ أَنْ لَا إِلَٰهَ إِلَّا اللَّهُ، وَأَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللَّهِ
Pronunciation: Ash-hadu an lā ilāha illā Allāh, wa ash-hadu anna Muḥammadan rasūlu Allāh
Meaning: I bear witness that there is no god worthy of worship except Allah, and I bear witness that Muhammad is the Messenger of Allah.
The evidence
«بُنِيَ الإِسْلَامُ عَلَى خَمْسٍ: شَهَادَةِ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ، وَإِقَامِ الصَّلَاةِ، وَإِيتَاءِ الزَّكَاةِ، وَالْحَجِّ، وَصَوْمِ رَمَضَانَ»
Islam is built upon five: the testimony that there is no god but Allah and that Muhammad is the Messenger of Allah, establishing the prayer, giving zakat, the pilgrimage, and fasting Ramadan.
Sahih al-Bukhari 8— Read the original textNote: If you have just embraced Islam: everything before it is wiped away. The Prophet ﷺ said, “Do you not know that Islam erases all that came before it?” You begin with a clean slate.