Musannaf Ibn Abi Shaybah

Hazrat Amr bin Muhajir narrates that Muhammad bin Suwaid Fahri celebrated Eid-ul-Fitr or Eid-ul-Adha one day before the people. Hazrat Umar bin Abdul Aziz wrote him a letter asking the reason for this, so Muhammad wrote back that Hizam bin Hakeem Qureshi testified before me that he had seen the moon. Hazrat Umar bin Abdul Aziz wrote him a letter saying, "On the testimony of one man? Can he be equal to two men?"