In plain terms
Iman
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Both vowels are long in Arabic.

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Iman is faith: belief in God, His angels, His books, His messengers, the Last Day, and divine decree. Hadith describe it as including both conviction and action. Its opposite is kufr, disbelief.
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Related terms
Tawhid
Tawhid is the oneness of God, the central concept of Islamic belief. It affirms that God alone is worthy of worship, without partner or equal. Its opposite is shirk, associating…
Kufr
Kufr is disbelief: the rejection of core articles of Islamic faith. Scholars distinguish between kufr as a technical description of a belief or act, and kufr as a judgment about…
Shahadah
The shahadah is the declaration of faith: testifying that there is no god but God, and that Muhammad is His messenger. It is the first of the five pillars of Islam, and the…