The Devils Deception by Imam Ibn AL-Jawzi

Chapter Seven: Devil's Deception of the Scholars (al- 'uldma')
[ 7:1 ]
The Devil's Deception of the Reciters (al-Qurra) [of
the Qur'an]
An example of this is for reciters to become keen on learning odd
(invalid) versions of qird'dt (recitation). They spend most of their
lives in collecting these versions and teaching them to others. They
do this to the point that they miss out on performing their obligatory
rituals. Sometimes a Imam may be fluent at recitation, but not
well versed in what invalidates prayer.
Had these people contemplated, they would have realised that the
objective is to memorise, understand and follow the Qur'an, to be
keen on reforming one's self and purifying one's manners, and then
to move onto other important religious sciences.
Al-I:Iasan al-BarI said: The Qur'an was revealed to be acted upon.
Instead, people took its recitation as the (required) deed.
He meant that they only recite it without acting upon it.
Another example is that some readers recite an odd mode of style
in prayer instead of using the agreed upon modes.
Scholars say that prayers are not valid if such versions are used for
recitation. Those who do so only showoff to gain people's recognition,
while he sees himself as a person who is dedicating much of
his time to the Qur'an.
Others recite the same words but from different versions; so he
would say: Maliki ( ), Maliki (L..) and Mallaki (!1)1.... ). This is
not permissible because it goes against the flow of the Qur'an.
1 99