Allah dah ajar kita cara nak ucap sahadah, jangan pandai pandai nak tambah.
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The correct Testimony has no name in it except the name of God.
First
First and foremost, the only Testimony authorised by God in the Quran is:
"God bears witness that there is no god except He, and so do the angels and those who possess knowledge. Truthfully and equitably, there is no god but He, the Almighty, Most Wise" 3:18
Allah menerangkan (kepada sekalian makhlukNya dengan dalil-dalil dan bukti), bahawasanya tiada Tuhan (yang berhak disembah) melainkan Dia, Yang sentiasa mentadbirkan (seluruh alam) dengan keadilan, dan malaikat-malaikat serta orang-orang yang berilmu (mengakui dan menegaskan juga yang demikian); tiada Tuhan (yang berhak disembah) melainkan Dia; Yang Maha Kuasa, lagi Maha Bijaksana.
(A-li'Imraan 3:18)
The words "there is no god but God", which in Arabic are (La Ilaha Ila Allah), are the exact words which God Himself utters, also the angels and those who possess knowledge.
The majority of Muslims today are not satisfied with the Shahada given in 3:18 and they add to it the words: "and I bear witness that Muhammad is His messenger".
To add any words or names to the Testimony given by God is in fact to imply that the Testimony given by God in the Quran is incomplete, or that God forgot the second half of the Testimony! Needless to say, God is not forgetful nor does God make misatkes!
We are commanded clearly in the Quran to follow the Quran and nothing else (see: Quran Alone). As a result, all those who utter the shahada which includes the name of the prophet Muhammad are not following the Quran.