: Truly, when it was said to them: La ilaha ill-Allah "(none has the right to be worshipped but Allah)," they puffed themselves up with pride (i.e. denied it).
: Nay! he (Muhammad SAW) has come with the truth (i.e. Allah's Religion - Islamic Monotheism and this Quran) and he confirms the Messengers (before him who brought Allah's religion - Islamic Monotheism).