Why wasn’t Prophet Adam (PBUH) protected from the whispers of Iblis (LA) like Prophet Muhammad (PBUH & His Progeny) and His Progeny (PBUT).

Why are only The Prophet Muhammad (PBUH & His Progeny) and His Progeny (PBUT) protected from whispers of Iblis (LA).

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Indeed Allah protected both Adam and Hawa and they did not commit any sin. What happened was a source of procreation on earth.