The harfNon-Governing Particlesadvanced term
In one line
The deterrence particle — كَلَّا: “By no means!”, slamming the door on what was just said.
Classical definition
كَلَّا حَرْفُ رَدْعٍ وَزَجْرٍ يُفِيدُ النَّهْيَ عَنْ قَوْلٍ أَوْ فِعْلٍ سَابِقٍ.
“Kalla is a particle of rebuke and deterrence, conveying prohibition of a preceding word or deed.”
Key words in the Arabic
رَدْع وَزَجْرrebuke and deterrence
Understand it
كَلَّا rejects what came before it — a claim, a hope, an excuse — and often pivots the passage: كَلَّا سَيَعْلَمُونَ, “No indeed — they will come to know”. In later suras it fires like a hammer-blow; some readings treat certain occurrences as “truly” (softened emphasis), which is why translations of the same كَلَّا differ.
How to spot it
Recognition test
كَلَّا at a clause break — rejection of what precedes, warning in what follows.
In the Qur'an
ثُمَّ كَلَّا سَوْفَ تَعْلَمُونَ
At-Takathur 102:4 — “Again, ye soon shall know!”
كَلَّا slams the door on what was just said. It is not a no to a question — it is a refusal of the whole assumption behind it, which is why English needs a phrase where Arabic needs a word.
Related terms
Common questions
Is this just a strong way of saying no?
It is more specific than that. It does not answer a question — it rejects the assumption behind what was just said, and closes it off. English needs a phrase where Arabic needs a word, which is why translations of it vary so much.
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