102. Tekathur · verses 4–5

ثُمَّ كـَلَّا سَوۡفَ تَعۡلَمُونَ

Thumma kalla sawfa taAAlamoona

Again, ye soon shall know!

كـَلَّا لَوۡ تَعۡلَمُونَ عِلۡمَ ٱلۡيَقِينِ

Kalla law taAAlamoona AAilma alyaqeeni

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