كـَلَّا لَوۡ تَعۡلَمُونَ عِلۡمَ ٱلۡيَقِينِ ٥
No! If you only knew with knowledge of certainty...1
Translation: Saheeh International (English)
1 The conclusion of this verse is estimated to be "...you would not have been distracted from preparing for the Hereafter."
Each word's meaning and sound
Truly, if you were to know with certainty that you are to be resurrected to Allah, and that He will requite you for your actions, you would not become preoccupied with boasting with one another over wealth and offspring.
Al-Mukhtasar in interpreting the Noble Quran