The Holy Apostle
The innovation of something new in religion is a malicious accusation of falsehood against Allah Most Glorious, for Allah Himself states: -
"This day I have perfected your religion for you and completed My favour unto you, and have chosen for you as a religion Al-Islam." (V: 3)
So if anyone originated an innovation, it as if, ‘Allah forbid!’ implies
that there was still something lacking in religion. Similarly, it also
amounts to - Allah forbid! – a false charge of misappropriation against
the Holy Prophet 
that, it is as if, he did not convey to us some part of the religion, as
Imam Malik observes that anyone who invented anything in Islam and considered
this new thing better, he - Allah forbid! -accused Muhammad
of misappropriation and suppression in conveying the divine commandments.
The divine statement is: "This day I have perfected your religion for you."
Hence the work which was not a part of religion in the Holy Prophet's
time which he neither did himself nor persuaded others to do, cannot be
included in religion today also. (AI-l'tesam, vol.1, p.48).
