Dialects and Readings of the Qur'an (Kitab Al-Huruf Wa Al-Qira'at)
Dawud :: Book 30 : Hadith 3974
Narrated Ubayy ibn Ka'b:
The Prophet (peace_be_upon_him) read the Qur'anic verse: "Thou hast received (full) excuse from me (min ladunni)" and put tashdid (doubling of consonants) on nun (n).