وَعَنْ أَبِي عُمَيْرِ بْنِ أَنَسٍ
عَنْ عُمُومَةٍ لَهُ مِنَ اَلصَّحَابَةِ، «أَنَّ رَكْبًا جَاءُوا، فَشَهِدُوا أَنَّهُمْ رَأَوُا الْهِلَالَ بِالْأَمْسِ، فَأَمَرَهُمْ اَلنَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: أَنْ يُفْطِرُوا، وَإِذَا أَصْبَحُوا يَغْدُوا إِلَى مُصَلَّاهُمْ»
Were among the Companions, that some riders came and testified that they had seen the new moon the previous day. The Prophet (sallallahu alayhi wa sallam) therefore commanded the people to break the fast and go out to their place of prayer in the morning.
Bulugh al-Maram 586, Book 2, The Book of Prayer, Hadith 407. 1 min read