The word Iman is derived from the Arabic verb "a-ma-na" and is used in the article ifgal. And the general concept of faith is belief. It means to confirm what one has said, to accept what he has said, to believe clearly and sincerely without questioning.

Allah Almighty says:

The Prophet believed in what was revealed to him from his Lord. All believers believe in God, the angels, the books and the prophets. "We do not distinguish between ambassadors, we have heard and obeyed. Our Lord! We ask You to bless us, and to You is our destination. " (285)

—Surat al-Baqara, verse 285