Is faith in the heart sufficient without verbalizing it with the tongue and acting with the limbs?

Question:
May Allah reward you, Honorable Shaykh Salih. This is another questioner, Abu Sa'id from al-Jubayl, who says: The phrase "faith in the heart" has become common on the tongues of some people. Is faith in the heart sufficient without verbalizing it with the tongue and acting with the limbs?

Answer:
No, faith in the heart is not sufficient. Yes, the belief of the heart and its affirmation of the two testimonies are necessary, but along with this, action with the limbs is required. There must be outward action. Faith in the two testimonies and knowing their meaning is in the heart. As for acting upon the five pillars, the six pillars, which are the pillars of faith and the pillars of Islam, both must be present: faith in the heart and Islam outwardly, Islam openly, and faith in the heart. The combination of faith and Islam is required. Yes.