(7) Fasting
كتاب الصوم
(2a) Chapter: Seeing the New Moon - Section 1
(1) باب رؤية الهلال - الفصل الأول
Mishkat al-Masabih 1972 
Abu Bakra reported God’s messenger as saying, “The months of festival, Ramadan and Dhul-hijja, are not defective.”* *The most probable meaning is that, even if these months have only twenty-nine days, they are not on that account to be considered deficient in comparison with a month which has thirty days. (Bukhari and Muslim.)
وَعَنْ أَبِي بَكْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " شَهْرَا عِيدٍ لَا يَنْقُصَانِ: رَمَضَانُ وَذُو الْحِجَّةِ "
 مُتَّفَقٌ عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 1972
In-book reference : Book 7, Hadith 16