[Machine] Ammaar, the one who fasted on the Day of Doubt, has disobeyed Aba Al-Qasim ﷺ. Al-Bukhari has mentioned this in his text on the explanation of the chapter.
عَمَّارٌ مَنْ صَامَ يَوْمَ الشَّكِّ فَقَدْ عَصَى أَبَا الْقَاسِمِ ﷺ أَخْرَجَ الْبُخَارِيُّ مَتْنَهُ فِي تَرْجَمَةِ الْبَابِ
[Machine] Ammar ibn Yasir said, "Whoever fasts on the day that is doubted has disobeyed Abu al-Qasim (referring to Prophet Muhammad)."
عَمَّارُ بْنُ يَاسِرٍ «مَنْ صَامَ الْيَوْمَ الَّذِي يُشَكُّ فِيهِ فَقَدْ عَصَى أَبَا الْقَاسِمِ ﷺ»
[Machine] "Ammar said: 'Whoever fasts on the Day of Doubt (the day before the new moon is sighted to mark the beginning of Ramadan), has disobeyed Abu Al-Qasim (referring to Prophet Muhammad peace be upon him)."
عَمَّارٌ «مَنْ صَامَ يَوْمَ الشَّكِّ فَقَدْ عَصَى أَبَا الْقَاسِمِ ﷺ»
[Machine] Ammar ibn Yasir said, "Whoever fasts on the day which is doubted (uncertain), has disobeyed Prophet Muhammad ﷺ ."
عَمَّارُ بْنُ يَاسِرٍ «مَنْ صَامَ الْيَوْمَ الَّذِي يُشَكُّ فِيهِ فَقَدْ عَصَى أَبَا الْقَاسِمِ ﷺ»
[Machine] Ammar ibn Yassir said, "Whoever fasts on the day they have doubts about, has disobeyed Abu al-Qasim ﷺ ."
عَمَّارُبْنُ يَاسِرٍ «مَنْ صَامَ الْيَوْمَ الَّذِي يَشُكُّ فِيهِ فَقَدْ عَصَى أَبَا الْقَاسِمِ ﷺ»