Hadith #993Ungraded
أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ ، حَدَّثَنَا سُفْيَانُ ، عَنْ عَمْرٍو يَعْنِي ابْنَ دِينَارٍ ، عَنْ مُحَمَّدِ بْنِ جُبَيْرٍ ، عَنْ ابْنِ عَبَّاسٍ رَضِيَ اللهِ عَنْهُمَا، أَنَّهُ عَجِبَ مِمَّنْ يَتَقَدَّمُ الشَّهْرَ ، وَيَقُولُ : قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ :" إِذَا رَأَيْتُمُوهُ، فَصُومُوا، وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا، فَإِنْ غُمَّ عَلَيْكُمْ، فَأَكْمِلُوا الْعِدَّةَ ثَلَاثِينَ يَوْمًا "
It was narrated from Ibn Abbas (may Allah be pleased with them both) that he expressed wonder at those who begin fasting before the month, saying that the Messenger of Allah ﷺ said: 'When you see it, fast; and when you see it, break your fast. If it is obscured from you, then complete the count as thirty days.'