وَعَنِ اِبْنِ عَبَّاسٍ رَضِيَ اَللَّهُ عَنْهُمَا
أَنَّ أَعْرَابِيًّا جَاءَ إِلَى اَلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: «إِنِّي رَأَيْتُ اَلْهِلَالَ، فَقَالَ: «أَتَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اَللَّهُ? «قَالَ: نَعَمْ. قَالَ: «أَتَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اَللَّهِ? «قَالَ: نَعَمْ. قَالَ: «فَأَذِّنْ فِي اَلنَّاسِ يَا بِلَالُ أَنْ يَصُومُوا غَدًا»
‘A Bedouin came to the Prophet (sallallahu alayhi wa sallam) and said, ‘I have sighted the crescent (of Ramadan). He then said to him, ‘Do you testify that there is none worthy of worship but Allah?’
The Bedouin said, ‘Yes.’ He asked him again, ‘Do you testify that Muhammad is the Messenger of Allah (sallallahu alayhi wa sallam)?’ The man replied, ‘Yes.’ The Messenger of Allah (sallallahu alayhi wa sallam) there upon said, ‘O Bilal! Announce to the people to (start) fasting tomorrow.’ Related by the five Imams. Ibn Khuzaimah and Ibn Hibban graded it as Sahih.
An-Nasai said that it is most probably Mursal (a Hadith in which the link between the Successor (Tabii) and the Prophet (sallallahu alayhi wa sallam) is missing.’’