Word by Word Analysis

وَلَوْلَآ أَن تُصِيبَهُم مُّصِيبَةٌۢ بِمَا قَدَّمَتْ أَيْدِيهِمْ فَيَقُولُوا۟ رَبَّنَا لَوْلَآ أَرْسَلْتَ إِلَيْنَا رَسُولًا فَنَتَّبِعَ ءَايَـٰتِكَ وَنَكُونَ مِنَ ٱلْمُؤْمِنِينَ 47

And if not that a disaster should strike them for what their hands put forth [of sins] and they would say, "Our Lord, why did You not send us a messenger so we could have followed Your verses and been among the believers?"...