The essence of Muhammad's testimony
This is a concise treatise about (the essence of testifying that Muhammad is the messenger of Allah), we felt it necessary to publish it for humans. And because we see a lot of ignorance among Muslims and other than them, regarding the essence of testifying/shahadah that Muhammad is the messenger of Allah I, they fall into things that violate it from what it should be, or contradict its perfection, or reduce the servant's faith in it.