The Twofold Warning (Kallā Sa-yaʿlamūn) كَلَّا سَيَعْلَمُونَ

Overview

The opening of Sūrah An-Naba reports a dispute: people ask one another about the great news over which they differ (78:1–3). The Qur'an answers not with a drawn-out argument but with a short, doubled warning: “No indeed! They will come to know. Again, no indeed! They will come to know” (كَلَّا سَيَعْلَمُونَ ۝ ثُمَّ كَلَّا سَيَعْلَمُونَ, 78:4–5). The same words are spoken twice, and only after them does the sūrah lay out its signs of creation as evidence that the disputed Day is real. Notice what the warning actually promises the deniers: not first that they will be punished, but that they will come to know. The Day is coming whether or not they ready themselves for it — and a Lord who tells you that in advance is not closing the door, but holding it open.

Etymology and meaning

The word كَلَّا (kallā) is a particle of rebuke and refusal — “no indeed,” “nay,” “by no means.” It does more than negate; it cuts off the deniers' position and recoils against it. سَيَعْلَمُونَ (sa-yaʿlamūn) joins the future particle sa- to the verb “they will know,” so the phrase means “they are going to come to know” — a knowledge that arrives whether or not they accept it now. The second verse adds ثُمَّ (thumma), “then” or “again,” restating the whole warning. The repetition is the rhetorical heart of the passage: a warning given once for emphasis, given again so it cannot be missed.

Qur'anic references

• 78:2 — “About the great news”
• 78:3 — “over which they are in disagreement”
• 78:4 — “No indeed! They will come to know”
• 78:5 — “Again, no indeed! They will come to know”
• 78:17 — “Indeed, the Day of Decision is an appointed time”
• 102:3 — “No indeed! You are going to know”
• 102:4 — “Then, no indeed! You are going to know”

Significance

The doubled kallā does two things at once. First, it overturns the deniers' premise: their dispute over the resurrection is set aside, and the matter is treated as already decided. Second, the repetition presses the certainty home — what is said once for emphasis is said twice for finality. The grammar is forward-looking: sa-yaʿlamūn, “they will know,” postpones nothing about the truth itself, only the deniers' recognition of it. The truth is not waiting on their assent; it is simply waiting for them.

The passage sets the agenda for the whole sūrah. The “knowing” promised here is fulfilled later in the text: the signs of creation make the case, the Day of Decision is named as an appointed time (78:17), and the two ends are drawn — the recompense of the transgressors against the reward of the God-conscious. The same construction recurs in Sūrah At-Takāthur (102:3–4), where the identical doubled warning — kallā sawfa taʿlamūn, then again — addresses those distracted from the reckoning. Across both sūras the warning takes the same shape: a certainty announced in advance, to people who still have time to act on it.

And here is where the certainty turns toward you. Notice where this confidence comes from: not from the strength of an argument, but from who stands behind the appointment. The Day is fixed because the One who fixed it is the only One who arranges all things — the Day of Decision is His appointment alone (78:17), and there is no second hand on the scale, no rival to overturn what He has set. That is the pivot the whole warning rests on: the certainty is not really about the future, it is about Him. A truth guaranteed by the one Lord of everything does not need your agreement to be true; it only waits for you to recognise it.

And something in you is already close to that recognition. The doubled warning is not telling a settled heart something foreign — it is naming what you half-suspect when the noise goes quiet: that the matter is not actually open, that the reckoning is real, that you were made knowing this. The verse does not plant the certainty in you; it uncovers it. That quiet sense that the Day is coming is your own fitra answering the One who shaped it.

So the repeated warning is mercy hurried — the same news, said twice, because the One who sends it would rather you arrive at the truth early than meet it late. There is a knowing that comes on its own appointed Day, when nothing is left to choose; and there is a knowing offered now, while the heart can still answer it. The kind thing the Qur'an asks is not that you lose an argument, but that you turn — while “they will come to know” can still become I have come to know, and the One who warned you finds you already on the way to Him.

See also

• The Great News (An-Naba al-ʿAẓīm)
• The Day of Decision
• Signs of Creation
• Recompense of the Transgressors

References

1. The Qur'an, Sūrah An-Naba 78:4–5, in the context of 78:1–3 and 78:17.
2. The Qur'an, Sūrah At-Takāthur 102:3–4, the parallel doubled warning.