Hadith 2122
Chapter 11: Mentioning The Differences Reported From 'Ubaidullah Bin 'Umar - كتاب الصيام
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، قَالَ حَدَّثَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " لاَ تَصُومُوا حَتَّى تَرَوْهُ وَلاَ تُفْطِرُوا حَتَّى تَرَوْهُ فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا لَهُ " .
It was narrated form Ibn 'Umar that the Prophet said:
"D not fast until you see it , and do not stop fasting until you see it, and if it is obscured from you (too cloudy), then work it out."
Reference : Sunan an-Nasa'i 2122
In-book reference : Book 22, Hadith 33