Somebody was beating his slave with a whip. The Prophet Muhammad (PBUH) silently came close from behind and called the beating person:

“You should know that the power of Allah over you is greater than your power over this poor slave.”

The master who was filled up with fear from head to foot shook and the whip fell on the ground from his hand. He turned to the Prophet Muhammad (PBUH):

“O the Apostle of Allah! Be the witness; I am freeing this slave”.

The Prophet Muhammad (PBUH) called again:

“If you had not done so, you would have been roasted in Hell.”