Authentic
graded by Al-Albani
Mishkat al-Masabih 1450
وَعَنْ أَبِي عُمَيْرِ بْنِ أَنَسٍ عَنْ عُمُومَةٍ لَهُ مِنْ أَصْحَابِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: أَنَّ رَكْبًا جَاءُوا إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَشْهَدُونَ أَنَّهُمْ رَأَوُا الْهِلَالَ بالْأَمْس ن فَأَمرهمْ أَن يفطروا وَإِذا أَصْبحُوا أَن يَغْدُو إِلَى مصلاهم. رَوَاهُ أَبُو دَاوُد وَالنَّسَائِيّ
Abu ‘Umair b. Anas told on the authority of some of his paternal uncles who were companions of the Prophet that some men came riding to the Prophet and testified that they had seen the new moon the previous day. He therefore commanded the people to break the fast and go out to their place of prayer in the morning. Abu Dawud and Nasa’i transmitted it.
Cited in Mishkat al-Masabih (No. 1450).