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