سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 2122
The Book of Fasting
Mentioning The Differences Reported From 'Ubaidullah Bin 'Umar
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 (ﷺ) 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."
Sunan an-Nasa'i, 2122Sahih (Darussalam)