And this is (that) Book which We have sent down, the most blessed one. It (authentically) confirms those revealed Books that preceded it. And (this) has been (sent down) in order that (firstly) you warn the residents of the nucleus of all the (human) communities, Makka, and (secondly) the dwellers around it (the world over). And only those who believe in it have faith in the Last Day, and they alone keep a vigilant watch over their Prayers.