Sunan An-Nasa'i - سنن النسائي
22. The Book of Fasting - كتاب الصيام
13) Chapter: Mentioning The Differences Reported From Mansur In The Hadith Of Ribi
It was narrated that Ibn 'Abbas said:
"The Messenger of Allah said: "The Messenger of Allah said: Do not fast before Ramadan. Fast when you see it and stop fasting when you see it, and if clouds prevent you from seeing it, then complete Thirty (Days)."'
13) باب ذِكْرِ الاِخْتِلاَفِ عَلَى مَنْصُورٍ فِي حَدِيثِ رِبْعِيٍّ فِيهِ
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا أَبُو الأَحْوَصِ، عَنْ سِمَاكٍ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم . " لاَ تَصُومُوا قَبْلَ رَمَضَانَ صُومُوا لِلرُّؤْيَةِ وَأَفْطِرُوا لِلرُّؤْيَةِ فَإِنْ حَالَتْ دُونَهُ غَيَايَةٌ فَأَكْمِلُوا ثَلاَثِينَ "