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Shiavault - a Vault of Shia Islamic Books An Enlightening Commentary into the Light of the Holy Qur'an vol.
"And this (Qur'an) is a Book which we have sent down, blessed, so follow it, and keep from evil so that mercy may be shown to you." 156. "Lest you should say: The Book was sent down only to two parties (the Jews and the Christians) before us, and we were truly unaware of their studies." In order to complete the previous discussion upon the heavenly Book, this holy verse points to the revelation of the Qur'an and it’s teaching.
It says: "And this (Qur'an) is a Book which we have sent down, blessed, so follow it, and keep from evil so that mercy may be shown to you." In the second verse, mentioned in the above couple of verses, the Qur'an has closed all the ways of flight and seeking excuses to the pagans.
It announces that Allah has sent this heavenly book down, with those advantages, in order that the pagans do not say that the Book was sent down only to the couple of former parties, the Jews and the Christians, and that they were neglectful of studying, reviewing and discussing them. And, they should not say that they disobeyed the command of Allah because His commandment was under the control of others and it was not available for them.
"Or (lest) you should say: 'If the Book had been sent down to us, we would certainly have been better guided than them. 'So indeed there has come to you clear proof from your Lord, and guidance and mercy.