حَدَّثَنَا أَبُو مَرْوَانَ مُحَمَّدُ بْنُ عُثْمَانَ الْعُثْمَانِيُّ حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ عَنْ الزُّهْرِيِّ عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ عَنْ ابْنِ عُمَرَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا رَأَيْتُمْ الْهِلَالَ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْکُمْ فَاقْدُرُوا لَهُ قَالَ وَکَانَ ابْنُ عُمَرَ يَصُومُ قَبْلَ الْهِلَالِ بِيَوْمٍ
ابن ماجہ · Hadith 1654
It was narrated from Ibn 'Umar that the Messenger of Allah P.B.U.H said: 'When you see the new crescent, fast, and when you see it, stop fasting. If it is cloudy then calculate it (as thirty days)." Ibn 'Umar used to fast one day before the new crescent was seen. (Sahih)
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020