Cautionary Addition — "They Shall Not Delay an Hour Nor Advance"
balagha
Level: advanced
ijaz-ithnab
blg-039
Definition:
Cautionary addition (ihtiras / takmil): adding a qualification that preempts a misunderstanding the speech might invite — fortifying the meaning against any objection or misreading.
Quranic example: "When their time comes they shall not delay by an hour nor advance it." (Surah 7:34)
The beauty:
Saying only "they shall not delay" could imply they might advance. Saying only "they shall not advance" could imply they might delay. Both negations together close the door from either direction, sealing the meaning: the appointed term is fixed and moves in no direction.
Source: Al-Maydani (1/502); Al-Suyuti, Al-Itqan (3/361)
Question: Why did the Quran not suffice with one negation ("they shall not delay" alone) in this verse?
Answer: One negation closes one door while leaving the other open to misunderstanding. Both negations together fully seal the meaning: the appointed time neither advances nor delays under any circumstances.