Late Report of the Crescent Sighting
If the day of Eid is not determined until late in the day (past the time of the Eid prayer), then the Eid prayer is held the next day. Abu `Umayr Bin Anas reported that some of his uncles, who were from the Ansar, and who were companions of the Prophet (peace be upon him), told him:

"The crescent of Shawwal was obscure to us. So we continued to fast that morning; later in the day, a group of travelers arrived and testified before Allah's Messenger (peace be upon him) that they had seen the hilal (crescent) the previous day; so he (peace be upon him) commanded the people to break their fast on that day, and to go out to the musalla the following morning."
 
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