ثم كلا سيعلمون (78:5) بالانجليزي

(78:5) again, no indeed; soon will they come to know.

Tafseer Abu-al-A'la Maududi

Page 582 English Traditional

*3) That is, the time is not far off when the same thing about which they are expressing all sorts of meaningless doubts and misgivings, will appear before them as a reality. Then they will realize that what the Messenger had foretold was absolutely true and what they were saying on the basis of conjecture and speculation had no truth in it.