حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم خَرَجَ إِلَى مَكَّةَ عَامَ الْفَتْحِ فِي رَمَضَانَ فَصَامَ حَتَّى بَلَغَ الْكَدِيدَ ثُمَّ أَفْطَرَ فَأَفْطَرَ النَّاسُ وَكَانُوا يَأْخُذُونَ بِالأَحْدَثِ فَالأَحْدَثِ مِنْ أَمْرِ رَسُولِ اللَّهِ صلى الله عليه وسلم ‏.‏

Yahya related to me from Malik from Ibn Shihab from Ubaydullahibn Abdullah ibn Utba ibn Masud from Abdullah ibn Abbas that theMessenger of Allah, may Allah bless him and grant him peace, left forMakka in Ramadan during the year of the conquest, and fasted until hereached al-Kadid. He then broke the fast, and so everyone else did soas well. What people used to do was act according to whatever theMessenger of Allah, may Allah bless him and grant him peace, had donemost recently. Translation Not Available

Book Ref: Muwatta Imam Malik Book 18 Hadith 655
Web Ref:  Muwatta Imam Malik Book 18 Hadith 21