Entering Islam in its Entirety is obligated

Allah commands His servants who believe in Him and have faith in His Messenger to implement all of Islam's legislation and law, to adhere to all of its commandments, as much as they can, and to refrain from all of its prohibitions. `Al-`Awfi said that Ibn `Abbas said, and also Mujahid, Tawus, Ad-Dahhak, `Ikrimah, Qatadah, As-Suddi and Ibn Zayd said that Allah's statement:

ادْخُلُواْ فِي السِّلْمِ

The previous verses ended with a word of praise for the sincere. As sincerity (ikhlas اخلاص) can sometimes touch the limits of excess inadvertently, that is, one does intend to come up with more obedience, but that obedience, when observed carefully, turns out to be exceeding the limits set by the Shari'ah and Sunnah. This is called bid'ah بدعت . This can be explained through the example of the blessed Companion ` Abdullah ibn Salam ؓ and others who were, previous to their Islam, known scholars among the Jews. Since Saturday was the sacred day of rest (the Sabbath اَسَّبت) in Judaism, and camel-meat was unlawful, they thought, once they were in Islam, to bring about some sort of a synthesis between the two faiths, through which they could continue to honour Sabbath سَبِّت as it was necessary under the law of Moses while Islam did not require dishonouring it; and similarly, they could simply avoid eating camel-meat in practice while believing that it was lawful, for it was unlawful in the law of Moses but Islam does not make it obligatory to eat it. Thus, they thought that they would stay in touch with the law of Moses and still not go against the Shari'ah of Muhammad ﷺ ، something that appealed to them as a stronger demonstration of obedience to divine laws and a closer approach to matters of faith. Allah Almighty corrects this thought in the present verse which aims to establish that Islam is an obligation in its totality. It is total and perfect only when what is not necessary in Islam is not considered to be a part of it. To take such thought or practice as part of the Faith is a Satanic slip which may bring far more severe a punishment than common sins would.

It is in this background of the verse's revelation, that believers have been asked to 'enter Islam completely', not making allowances for a faith other than Islam - a divisive approach which makes one an easy target of Satan. Therefore, the prohibition 'do not follow the footsteps of Satan', an enemy who would cheat you into taking to something which obviously looks very much like your Faith, but happens to be totally contrary to it in reality. After having received clear laws and rules that lead to the straight path, there is no justification left for any deviation. Those who still slip, they must remember that Allah is Mighty, having the power to punish, and Wise too, lest one should misread any delay in punishment which comes when His Wisdom so dictates. Using an eloquent image, the text goes on to question the ultimate acceptance of truth at a time when it shall no longer remain worth accepting and al'_ matters of reward and punishment shall revert to Allah with no power existing other than Him, why then would anyone become quixotic enough to stand against a Power so obvious, the result of which could be nothing but destruction.