A Benefit in Knowing the Evidence for the Two Testimonies

The Shaykh : If someone were to ask, "What is your evidence for what you have testified to, namely that there is no god but Allah and that Muhammad is the Messenger of Allah?" I would say: As for the first part, my evidence for it is the fitrah (the innate natural disposition) and the Qur'an. As for the Qur'an, Allah (Blessed and Exalted is He) said: As for the fitrah, a person who has not been assigned a Shaytan (Satan) or a corrupt environment testifies with his fitrah that there is no god but Allah, based on the saying of the Prophet (peace and blessings be upon him): .
Thirdly: Sense perception and reality. This is why it is said, "and those who have knowledge" And what is your evidence that Muhammad is the Messenger of Allah? How do you testify to it, and what is the evidence for it? We say that the evidence is in . As for his being a servant, Allah the Exalted said: So, we testify to this testimony—that there is no god but Allah and that Muhammad is His servant and His Messenger—based on what the Book and the Sunnah indicate. The proof from this hadith is its statement: , which corresponds to the noble verse, "Peace is from the Believer."