وَبِالَّيْلِۗ اَفَلَا تَعْقِلُوْنَ ࣖ ( الصافات: ١٣٨ )
wabi-al-layli
وَبِٱلَّيْلِۗ
And at night
afalā
أَفَلَا
Then will not
taʿqilūna
تَعْقِلُونَ
you use reason?
Wa billail; afalaa ta'qiloon (aṣ-Ṣāffāt 37:138)
Sahih International:
And at night. Then will you not use reason? (As-Saffat [37] : 138)
1 Mufti Taqi Usmani
and by nightfall. Would you still not understand?