﴿ ثُمَّ كَلَّا سَيَعْلَمُونَ ﴾

“And once again: Nay, but in time they will come to understand!”

Again no indeed! They will come to know! reiterated for emphasis; thumma is added here to declare that the second threat of chastisement is more severe than the first. God exalted be He then alludes to His power to resurrect saying