Hadhrat Abdullah bin Mas’ood رضي الله عنه said,
“When a man from the companions of Nabi ﷺ met a man from the Jinn and they wrestled, the human floored the Jinn. The Jinn asked for another wrestling bout and this time the human floored him yet again. The human then asked, ‘You appear to be extremely feeble and pale and your forearms resemble those of a dog. Are all of you jinn like this?’
‘No, By Allah!’ the Jinn replied, ‘Some of us are very powerfully built. Nevertheless wrestle me for the third time and if you manage to floor me again, I shall teach you something that will be of great benefit to you.’
The human fought with him again and after flooring him, said, ‘Come tell me what it is.’
‘Do you recite Ayatul Kursi?’ The Jinn enquired.
When the human told him that he did, the Jinn said, ‘Whenever you recite it in your house, every shaytaan vacates the house, braying like a donkey and will not enter again until the morning.”
“O Abu Abdur Rahman!” someone asked Hadhrat Abdullah bin Mas’ood رضي الله عنه, “Who was that companion of Nabi ﷺ?”
Hadhrat Abdullah bin Mas’ood رضي الله عنه frowned, turned to the person and replied, “Who else could he be but Hadhrat Umar رضي الله عنه?”