102:5
كَلَّا لَوْ تَعْلَمُونَ عِلْمَ ٱلْيَقِينِ
kallā law taʿlamūna ʿil'ma l-yaqīni
No! If you only knew with knowledge of certainty...
— Saheeh International
No indeed! If only you knew for certain.
— M. A. S. Abdel Haleem
Nay! If you knew with a sure knowledge (the end result of piling up, you would not have been occupied yourselves in worldly things).
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali