I heard Hisham bin Hakim reciting Surat-al-Furqan during the lifetime of Allah's Messenger (ﷺ), I listened to
his recitation and noticed that he was reciting in a way that Allah's Messenger (ﷺ) had not taught me. I was
about to jump over him while He was still in prayer, but I waited patiently and when he finished his
prayer, I put my sheet round his neck (and pulled him) and said, "Who has taught you this Sura which
I have heard you reciting?" Hisham said, "Allah's Messenger (ﷺ) taught it to me." I said, "You are telling a
lie, for he taught it to me in a way different from the way you have recited it!" Then I started leading
(dragged) him to Allah's Messenger (ﷺ) and said (to the Prophet), " I have heard this man reciting Surat-al-
Furqan in a way that you have not taught me." The Prophet (ﷺ) said: "(O `Umar) release him! Recite, O
Hisham." Hisham recited in the way I heard him reciting. Allah's Messenger (ﷺ) said, "It was revealed like
this." Then Allah's Messenger (ﷺ) said, "Recite, O `Umar!" I recited in the way he had taught me, whereupon
he said, "It was revealed like this," and added, "The Quran has been revealed to be recited in seven
different ways, so recite of it whichever is easy for you ." (See Hadith No. 514, Vol. 6)
Sahih al-Bukhari Book 97, Hadith 175
"I said: 'O Messenger of Allah, teach me a supplication from which I may benefit.' He said: 'Say: Allahumma 'afini min sharri sam'i, wa basari, wa lisani, wa qalbi, wa min sharri mani (O Allah, protect me from the evil of my hearing, my seeing, my tongue and my heart, and from the evil of my sperm.)'" - Meaning sexual organ.
Sunan an-Nasa'i Book 50, Hadith 29