“A Bedouin came to the Prophet ﷺ and said: ‘I have seen the new crescent tonight.’ He said: ‘Do you bear witness that none has the right to be worshipped but Allah and that Muhammad is the Messenger of Allah ﷺ?’ He said: ‘Yes.’ He said: ‘Get up, O Bilal, and announce to the people that they should fast tomorrow.’” Abu 'Ali said: "This is how it was narrated from Walid bin Abu Thawr and Hasan bin 'Ali. It was also narrated from Hammad bin Salamah, but he did not mention Ibn 'Abbas. He said: 'And he announced that they should perform the prayer and that they should fast.'" (Using translation from Ibn Mājah 1652)
جَاءَ أَعْرَابِيٌّ إِلَى النَّبِيِّ ﷺ فَقَالَ أَبْصَرْتُ الْهِلَالَ اللَّيْلَةَ فَقَالَ «أَتَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ؟» فَقَالَ نَعَمْ قَالَ «قُمْ يَا بِلَالُ فَأَذِّنْ فِي النَّاسِ فَلْيَصُومُوا» قَدِ احْتَجَّ الْبُخَارِيُّ بِعِكْرِمَةَ وَاحْتَجَّ مُسْلِمٌ بِسِمَاكٍ «وَ