Volume 6, Book 60, Number 38:
Narrated Sahl bin Sad: The Verse:–
“And eat and drink until the white thread appears to you distinct from the black thread.” was re –
vealed, but: ‘… of dawn’ was not revealed (along with it) so some men, when intending to fast, used to
tie their legs, one with white thread and the other with black thread and would keep on eating till
they could distinguish one thread from the other. Then Allah revealed’ … of dawn,’ whereupon they
understood that meant the night and the day.