How does Imam Khomeini explain that a believer should never slander others?

He whose Guardian is God, the Blessed and Exalted, and who is taken by Him out from the darkness never commits another sin.

Imam warned believers against disobeying divine commands

How believers can enter the worlds of light and radiance, Imam Khomeini explained

Imam Khomeini, the leader of contemporary Muslim world, through his theological works explained the difference between the knowledge and faith.