Who said "The greatest enemy is within yourself."?

This quote is attributed to Muhammad.

The greatest enemy is within yourself. - Muhammad

"The greatest enemy is within yourself."

Muhammad

Religious Leader Prophet Arabian 570–632

"The best of you are those who have the best manners and character."

"Seek knowledge even if it is in China."

"The greatest jihad is to battle your own soul."

"Do not lose hope, nor be sad."