لَمْ يَغُرُّوكُمْ غُرُورًا وَلَكِنْ رَفَعَ الْآلُ شَخْصَهُمْ وَالضَّحَاءُ
They did not arrive by stealth; their figures were visible in the heat mirage.
Lam negates and puts the following imperfect in the jussive, while wa-lākin introduces a correction. The repeated root in yaghurrūkum ghurūran intensifies the denied accusation. The sentence moves from rejecting an impression to offering a visual account.