Is the Hadith: "Whoever says 'There is no god but Allah' will enter Paradise" completed by "even if he commits zina and theft"? And is merely uttering "There is no god but Allah" and believing in it sufficient to enter Paradise?

It is not permissible to use general hadiths that speak of entering Paradise merely by saying "La ilaha illa Allah" (There is no god but Allah) without considering the hadiths that qualify and explain them. Entering Paradise necessitates disbelieving in everything worshipped besides Allah, and that the pronouncement of the two testimonies of faith (Shahadatayn) be based on knowledge, certainty, truthfulness, sincerity, and action in accordance with their implications.

The conditions for "La ilaha illa Allah" are: 1. Knowledge: That one knows its meaning and what it signifies. 2. Certainty: That one is certain of it, without doubt. 3. Truthfulness: That one says it truthfully from their heart, not falsely. 4. Sincerity: That one says it seeking the countenance of Allah the Almighty. 5. Acceptance: That one accepts it and does not reject it. 6. Submission: That one submits to what it signifies and acts upon it. 7. Love: That one loves this word and its people who act upon it.

These conditions are essential for the acceptance of the two testimonies of faith, in addition to believing in the Messenger, peace and blessings be upon him, and in what he brought. And whoever says it but does not believe its meaning or act upon its implications, will be fought until they act upon what it signifies.