People who testify that they saw the new moon the previous day: what is to be done

Abu Umayr bin Anas says: My paternal uncles from the Ansar narrated to me: Once the moon of Shawwal was hidden from us at night, so the next morning we were fasting. In the latter part of the day some riders came and testified before the Messenger of Allah (peace and blessings be upon him) that they had seen the moon the previous day. He ordered the people to break their fast, and said that the next day the people should come out to the Eid prayer ground for the Eid prayer.

The father of Abu Ya'fur says: Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) was the governor of Kufa. The moon of Ramadan was seen there. He did not come out for Eid that day. He came out the next day, addressed the people on a camel, and then went back.

Al-Zuhri says: Testimony was given before Sayyiduna Ibn Umar (may Allah be pleased with them both) that people had seen the moon of Eid. By then a large part of the day had passed, so Sayyiduna Ibn Umar (may Allah be pleased with them both) said: The Eid prayer will be offered tomorrow.