أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنْ مُطَرِّفٍ، عَنِ الشَّعْبِيِّ، عَنْ عَدِيِّ بْنِ حَاتِمٍ، أَنَّهُ سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ قَوْلِهِ تَعَالَى ‏ end actual hadith container 5‏ قَالَ ‏"‏ هُوَ سَوَادُ اللَّيْلِ وَبَيَاضُ النَّهَارِ ‏"‏ ‏.‏

It was narrated from 'Adiyy bin Hatim that: he asked the Messenger of Allah about the verse "Until the white thread (light) of dawn appears to you distinct from the black thread (darkness of night)." He said: "It is the blackness of the night and the whiteness of the day." ' Translation Not Available

Book Ref: Sunan An Nisai Book 22 Hadith 2169
Web Ref:  Sunan An Nisai Vol 3 Book 22 Hadith 2171