Muhammad was known as Al-Amin (the Trustworthy) by his people because he never lied and always kept his promises.

Muslims often cite the title Al-Amin, meaning 'the Trustworthy,' as evidence of Muhammad's honesty and integrity. They reference hadiths where even his enemies, like Abu Sufyan, acknowledged that he never lied or broke promises. However, this argument is problematic due to the absence of contemporaneous written records from Muhammad's time. The accounts we do have were written by Muslims long after his death, raising questions about their reliability. Furthermore, the tendency among early Muslims to fabricate stories to enhance Muhammad's image casts doubt on the authenticity of these claims. In fact, the Quran includes verses that reflect the skepticism of unbelievers regarding Muhammad's character, suggesting that the narrative of his trustworthiness is not as clear-cut as Muslims assert.