لَاا يَأْتِيهِ الْبَاطِلُ مِن بَيْنِ يَدَيْهِ وَلَاا مِنْ خَلْفِهِFalsehood cannot come to it from before it or behind it,means, there is no way to corrupt it, because it has been sent down by the Lord of the worlds.Allah says:تَنزِيلٌ مِّنْ حَكِيمٍ حَمِيدٍ(it is) sent down by the All-Wise, Worthy of all praise.meaning, He is Wise in all that He says and does, Praiseworthy in all that He commands and forbids; everything that He does is for praiseworthy purposes and its consequences will be good