The religion is sincerity (nasihah).
“The religion is sincerity (nasihah).”
Narrator: Tamim al-Dari
Source: Sahih Muslim 55
Explanation
When asked 'to whom?' the Prophet replied: 'To Allah, His Book, His Messenger, the leaders of the Muslims, and the common Muslims.' Sincerity is the foundation of every relationship.
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Sources.Hadith excerpts are taken from the Kutub al-Sittah (Sahih Bukhari, Sahih Muslim, Sunan Abu Dawud, Jami at-Tirmidhi, Sunan an-Nasa'i, Sunan Ibn Majah) with collection and number cited where applicable. Explanations are AI-assisted and reviewed against classical sources — see our editorial policy.