كتاب الصيام
22  
The Book of Fasting
(9)
Chapter: Completing thirty days Of Sha'ban if it is obscured (cloudy) and mentioning the differences reported by the narrators from Abu Hurairah
(9)
باب إِكْمَالِ شَعْبَانَ ثَلاَثِينَ إِذَا كَانَ غَيْمٌ وَذِكْرِ اخْتِلاَفِ النَّاقِلِينَ عَنْ أَبِي هُرَيْرَةَ ‏‏
Sunan an-Nasa'i 2117
It was narrated that Abu Hurairah said:
"the Messenger of Allah said: 'Fast when you see it and stop fasting when you see it, and if it is obscured from you (too cloudy), then count it as thirty (days). "'
أَخْبَرَنَا مُؤَمَّلُ بْنُ هِشَامٍ، عَنْ إِسْمَاعِيلَ، عَنْ شُعْبَةَ، عَنْ مُحَمَّدِ بْنِ زِيَادٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ صُومُوا لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنْ غُمَّ عَلَيْكُمُ الشَّهْرُ فَعُدُّوا ثَلاَثِينَ ‏"‏ ‏.‏
Grade: Sahih (Darussalam)
Reference : Sunan an-Nasa'i 2117
In-book reference : Book 22, Hadith 28
English translation : Vol. 3, Book 22, Hadith 2119