It is known by necessity that the Deen of Islam is complete, as Allah, the Exalted, says:
“This day, I have perfected your Deen for you, completed My Favor upon you, and have chosen for you Islam as your Deen.” (Surah Al-Ma'idah, 5:3)
It addresses every issue that concerns man in this life and in the Hereafter. Allah, the Exalted, says:
“And We have sent down to you the Book (the Qur'an) as an exposition of everything, a guidance, a mercy, and glad tidings for those who have submitted themselves (to Allah as Muslims).” (Surah An-Nahl, 16:89)
Whatever aspect of Shari'ah that has not been clarified in the first source of Islamic Law, which is the Qur'an, has been clarified in the second source of Islamic Law, which is the Sunnah. The Sunnah includes the Prophet's utterances, actions and approvals provided that it has been narrated to us with a sound chain of narration. Allah, the Exalted, says:
“And We have also sent down unto you (O Muhammad) the reminder and the advice (the Qur'an) that you may explain clearly to men what is sent down to them, and that they may give thought.” (Surah An-Nahl, 16:44)
The Prophet (Peace be upon him) clarified and showed his Ummah every good and warned them from every evil. The Prophet (Peace be upon him) said:
“There was no Prophet before me, except that it was incumbent upon him, to clarify to his Ummah the good that he knew of, and warn them from the evil that he knew of.” (Reported by Muslim)
Whoever believes other than that would certainly have disbelieved in the text of the Qur'an which was revealed to the Prophet (Peace be upon him).
The innovator in Deen believes that the Deen of Allah is incomplete, and indirectly he is saying that he is completing the Deen of Allah with his innovation!
The innovator in Deen would in effect be blaming the Prophet (Peace be upon him) for treachery because he did not convey the Message which he was charged with. He would be indirectly saying: 'Islam is in need of this innovation, which the Prophet was aloof of, therefore, I will complete the Deen with this innovation!'
The Prophet (Peace be upon him) said:
“I have left you on a clear path, its night is like its day, and no one would stray from it except a person who would be destructed.” (Reported by Hakim)
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