﴿ وَإِذْ ءَاتَيْنَا مُوسَى ٱلْكِتَٰبَ وَٱلْفُرْقَانَ لَعَلَّكُمْ تَهْتَدُونَ ﴾

“And [remember the time] when We vouchsafed unto Moses the divine writ-and [thus] a standard by which to discern the true from the false -so that you might be guided aright;”

True piety is to worship God alone, to believe in Him though one has not seen Him, to live in fear of Judgement Day, to subsist on the pure things of the earth, to prevent whomsoever one can from falling into sin. It is those who adopt this way of life who will be successful in the next world.