102:5

كَلَّا لَوْ تَعْلَمُونَ عِلْمَ الْيَقِينِ

Transliteration:

Kalla law taAAlamoona AAilma alyaqeeni

Word by Word:

Nay! If you know (with) a knowledge (of) certainty.

Translations:

Nay, if you could but understand [it] with an understanding [born] of certainty,

Nay, were ye to know with certainty of mind, (ye would beware!)

Nay, would that ye knew (now) with a sure knowledge!

Nay, would that you knew with a certain knowledge!

No! If you only knew with knowledge of certainty...