Dalil

Sahih Muslim 1080f

The obligation to fast Ramadan when the crescent is sighted, and to break the fast when the crescent is sighted, and that if it is cloudy at the beginning or end of the month, then the month should be completed as thirty days.

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وَحَدَّثَنِي حُمَيْدُ بْنُ مَسْعَدَةَ الْبَاهِلِيُّ حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ حَدَّثَنَا سَلَمَةُ وَهُوَ ابْنُ عَلْقَمَةَ عَنْ نَافِعٍ عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ؓ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ

الشَّهْرُ تِسْعٌ وَعِشْرُونَ فَإِذَا رَأَيْتُمُ الْهِلاَلَ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدِرُوا لَهُ

Translation

Chain of narrators
  1. Ḥumayd b. Masʿadah al-Bāhilī
  2. Bishr b. al-Mufaḍḍal
  3. Salamah / Ibn ʿAlqamah
  4. Nāfiʿ
  5. ʿAbdullāh b. ʿUmar
  6. Rasūl Allāh ﷺ

The month (of Ramadan) may consist of twenty nine days; so when you see the new moon observe fast and when you see (the new moon again at the commencement of the month of Shawwal) then break It, and if the sky is cloudy for you, then calculate it (and complete thirty days).

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Narrators

  1. حميد بن مسعدة السامي
  2. بشر بن المفضل الرقاشي
  3. سلمة بن علقمة التميمي
  4. نافع مولى ابن عمر
  5. عبد الله بن عمر العدوي