Translation of the verse 19 from Surah Al-Jinn : Number of verses 28 - - page 573 - Part 29.
(It has been revealed to me that) When the slave of Allah (Muhammad SAW) stood up invoking (his Lord Allah) in prayer to Him they (the jinns) just made round him a dense crowd as if sticking one over the other (in order to listen to the Prophet's recitation).
And that when the Servant of Allah stood up supplicating Him, they almost became about him a compacted mass."
(72:19) and when Allah's servant *20 stood up to call on Him, they well-nigh swarmed him.
*20) "Servant of AIIah": the Holy Prophet (upon whom be peace).