Messenger of Allah ﷺ set out for Mecca in Ramadan and he fasted, and when he reached Al-Kadid, he broke his fast and the people (with him) broke their fast too. (Abu ʿAbdullah said, "Al-Kadid is a land covered with water between Usfan and Qudaid.")
أَنَّ رَسُولَ اللَّهِ ﷺ خَرَجَ إِلَى مَكَّةَ فِي رَمَضَانَ فَصَامَ حَتَّى بَلَغَ الْكَدِيدَ أَفْطَرَ فَأَفْطَرَ النَّاسُ قَالَ أَبُو عَبْدِ اللَّهِ وَالْكَدِيدُ مَاءٌ بَيْنَ عُسْفَانَ وَقُدَيْدٍ
Yahya related to me from Malik from Ibn Shihab from Ubaydullah ibn Abdullah ibn Utba ibn Masud from Abdullah ibn Abbas that the Messenger of Allah ﷺ left for Makka in Ramadan during the year of the conquest, and fasted until he reached al-Kadid. He then broke the fast, and so everyone else did so as well. What people used to do was act according to whatever the Messenger of Allah ﷺ had done most recently.
أَنَّ رَسُولَ اللَّهِ ﷺ خَرَجَ إِلَى مَكَّةَ عَامَ الْفَتْحِ فِي رَمَضَانَ فَصَامَ حَتَّى بَلَغَ الْكَدِيدَ ثُمَّ أَفْطَرَ فَأَفْطَرَ النَّاسُ وَكَانُوا يَأْخُذُونَ بِالأَحْدَثِ فَالأَحْدَثِ مِنْ أَمْرِ رَسُولِ اللَّهِ ﷺ