BUKHARI 5571:
from Shahid al-ʿĪd Yawm al-Aḍḥá Maʿ ʿUmar b. al-Khaṭṭāb Faṣallá Qabl al-Khuṭbah Thum Khaṭab al-Nās —
the freed slave of Ibn Azhar that he witnessed the Day of ʿId-al-Adha with ʿUmar bin Al-Khattab. ʿUmar offered the ʿId prayer before the sermon and then delivered the sermon before the people, saying, "O people! Messenger of Allah ﷺ has forbidden you to fast (on the first day of) each of these two 'Ida, for one of them is the Day of breaking your fast, and the other is the one, on which you eat the meat of your sacrifices."
البخاري ٥٥٧١:
عن شهد العيد يوم الاضحى مع عمر بن الخطاب فصلى قبل الخطبه ثم خطب الناس —
يَا أَيُّهَا النَّاسُ إِنَّ رَسُولَ اللَّهِ ﷺ قَدْ نَهَاكُمْ عَنْ صِيَامِ هَذَيْنِ الْعِيدَيْنِ أَمَّا أَحَدُهُمَا فَيَوْمُ فِطْرِكُمْ مِنْ صِيَامِكُمْ وَأَمَّا الآخَرُ فَيَوْمٌ تَأْكُلُونَ نُسُكَكُمْ
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