Abu Umayr bin Anas narrates from some of his paternal uncles who were Companions of the Prophet (peace and blessings be upon him) (may Allah be pleased with them) that the people of Madinah began the morning fasting on the last day of Ramadan in the time of the Messenger of Allah (peace and blessings be upon him). Towards the end of the day a caravan arrived and testified before the Messenger of Allah (peace and blessings be upon him) that they had seen the crescent the day before, so the Messenger of Allah (peace and blessings be upon him) commanded the people to break their fast and to go to the Eid prayer-ground the next morning.
This is a hasan (good) chain. Abu Umayr narrated it from paternal uncles of his among the Companions of the Prophet (peace and blessings be upon him), and the Companions of the Prophet (peace and blessings be upon him) are all thiqat (trustworthy), so it makes no difference whether they are named or not.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8196
Anas (may Allah be pleased with him) narrates from his paternal uncles among the Ansar (may Allah be pleased with them) that they testified before the Messenger of Allah (peace and blessings be upon him) to having sighted the crescent, so he (peace and blessings be upon him) commanded them "to go out for their Eid the next day."
Sa'id bin Amir alone narrated it from Shu'bah, and he erred in it; Shu'bah only narrated it from Abu Bishr.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8197
Abu Umayr bin Anas narrates from his paternal uncles, who were Companions of the Messenger of Allah (peace and blessings be upon him) (may Allah be pleased with them), that a caravan came to him (peace and blessings be upon him) and testified to sighting the crescent, saying that they had seen it the day before. So he (peace and blessings be upon him) "commanded them to break their fast and to go out to the Eid prayer-ground the next day." Shu'bah said: This was at the end of the day.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8198
Rib'i bin Hirash narrates from one of the Companions (may Allah be pleased with him) that the people differed over the last day of Ramadan. Then two Bedouins came and testified before the Prophet (peace and blessings be upon him) that they had seen the crescent the day before, so he (peace and blessings be upon him) "commanded the people to break their fast and to come to the Eid prayer-ground the next day."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8199