Understanding the Sinlessness of Prophets and their “Reprimand” in the Qur’an
Source: SunniPath Answers (http://qa.sunnipath.com)

It is from obligatory Islamic belief that the Prophets were trustworthy and preserved from sin.

The classical definition of amana (trustworthiness), which relates to `isma (being preserved from sin) is:

“Allah Most High preserving the Prophets from falling into that which has been prohibited,” as explained by the commentators of the Jawhara. [Tattan/Kaylani, `Awn al-Murid `ala Jawharat al-Tawhid, 2.727; also: Bajuri, Tuhfat al-Murid]
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