KNOWLEDGE: ('ilm
That is, one must have the basic and general knowledge of what is meant by the shahadah. One must understand what the shahadah is affirming and what the shahadah is denying. Allah says in the Qur'an,
"So know that there is no God save Allah, and ask forgiveness for your sin."
(Surah Muhammad: 19).
Similarly, the Prophet (peace be upon him) said,
“Whoever dies knowing that there is no one worthy of worship except Allah shall enter Paradise.”
(Recorded in Sahih Muslim)