حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا هُشَيْمٌ، عَنْ أَبِي بِشْرٍ، عَنْ أَبِي عُمَيْرِ بْنِ أَنَسِ بْنِ مَالِكٍ، قَالَ حَدَّثَنِي عُمُومَتِي، مِنَ الأَنْصَارِ مِنْ أَصْحَابِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ قَالُوا: أُغْمِيَ عَلَيْنَا هِلاَلُ شَوَّالٍ. فَأَصْبَحْنَا صِيَامًا. فَجَاءَ رَكْبٌ مِنْ آخِرِ النَّهَارِ فَشَهِدُوا عِنْدَ النَّبِيِّ ـ صلى الله عليه وسلم ـ أَنَّهُمْ رَأَوُا الْهِلاَلَ بِالأَمْسِ. فَأَمَرَهُمْ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ أَنْ يُفْطِرُوا وَأَنْ يَخْرُجُوا إِلَى عِيدِهِمْ مِنَ الْغَدِ ‏.‏

It wasnarrated that Ibn ‘Abbas said

“A Bedouin came to the Prophet(ﷺ) and said: ‘I have seen the new crescent tonight.’ He said:‘Doyou bear witness that none has the right to be worshipped butAllahand that Muhammad is the Messenger of Allah (ﷺ)?’ He said:‘Yes.’ Hesaid: ‘Get up, O Bilal, and announce to the peoplethat they shouldfast tomorrow.’” Abu 'Ali said: "This is how itwas narrated from Walid bin AbuThawr and Hasan bin 'Ali. It wasalso narrated from Hammad binSalamah, but he did not mentionIbn 'Abbas. He said: 'And heannounced that they shouldperform the prayer and that theyshould fast.'"