عَن جُنْدُب بن عبد الله قَالَ: شَهِدْتُ الْأَضْحَى يَوْمَ النَّحْرِ مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَلَمْ يَعْدُ أَن صلى وَفرغ من صلَاته وَسلم فَإِذا هُوَ يرى لَحْمَ أَضَاحِيٍّ قَدْ ذُبِحَتْ قَبْلَ أَنْ يَفْرَغَ مِنْ صَلَاتِهِ فَقَالَ: «مَنْ كَانَ ذَبَحَ قَبْلَ أَنْ يُصَلِّيَ أَوْ نُصَلِّيَ فَلْيَذْبَحْ مَكَانَهَا أُخْرَى» . وَفِي رِوَايَةٍ: قَالَ صَلَّى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَوْمَ النَّحْرِ ثُمَّ خَطَبَ ثُمَّ ذَبَحَ وَقَالَ: «مَنْ كَانَ ذَبَحَ قَبْلَ أَنْ يُصَلِّيَ فَلْيَذْبَحْ أُخْرَى مَكَانَهَا وَمَنْ لَمْ يَذْبَحْ فليذبح باسم الله»

I was present at the festival on the day of sacrifice along with God’s Messenger. He had done no more than finish his prayer and give the salutation when he saw the flesh of sacrificial animals which had been sacrificed before he finished his prayer. So he said, “Anyone who has sacrificed before he prayed (or, we prayed) must sacrifice another in place of it." In a version he said: The Prophet prayed on the day of sacrifice, then delivered a sermon, then sacrificed, and he said, “Anyone who has sacrificed before he prayed (or, we prayed) must sacrifice another in place of it, and if anyone has not sacrificed he should do so in God’s name." (Bukhari and Muslim.)