Once during the lifetime of Messenger of Allah ﷺ we offered some animals as sacrifices. Some people slaughtered their sacrifices before the (Id) prayer, so when the Prophet ﷺ finished his prayer, he saw that they had slaughtered their sacrifices before the prayer. He said, "Whoever has slaughtered (his sacrifice) before the prayer, should slaughter (another sacrifice) in lieu of it; and whoever has not yet slaughtered it till we have prayed; should slaughter (it) by mentioning Allah's Name."  

ضَحَّيْنَا مَعَ رَسُولِ اللَّهِ ﷺ أُضْحِيَّةً ذَاتَ يَوْمٍ فَإِذَا أُنَاسٌ قَدْ ذَبَحُوا ضَحَايَاهُمْ قَبْلَ الصَّلاَةِ فَلَمَّا انْصَرَفَ رَآهُمُ النَّبِيُّ ﷺ أَنَّهُمْ قَدْ ذَبَحُوا قَبْلَ الصَّلاَةِ فَقَالَ مَنْ ذَبَحَ قَبْلَ الصَّلاَةِ فَلْيَذْبَحْ مَكَانَهَا أُخْرَى وَمَنْ كَانَ لَمْ يَذْبَحْ حَتَّى صَلَّيْنَا فَلْيَذْبَحْ عَلَى اسْمِ اللَّهِ  

I was with Messenger of Allah ﷺ on the day of 'Id al-Adha. While he had not returned after having offered (the Id prayer) and finished it, he saw the flesh of the sacrificial animals which had been slaughtered before he had completed the prayer. Thereupon he (the Holy Prophet) said: One who slaughtered his sacrificial animal before his prayer or our prayer ('Id), he should slaughter another one in its stead, and he who did not slaughter, he should slaughter by reciting the name of Allah.  

شَهِدْتُ الأَضْحَى مَعَ رَسُولِ اللَّهِ ﷺ فَلَمْ يَعْدُ أَنْ صَلَّى وَفَرَغَ مِنْ صَلاَتِهِ سَلَّمَ فَإِذَا هُوَ يَرَى لَحْمَ أَضَاحِيَّ قَدْ ذُبِحَتْ قَبْلَ أَنْ يَفْرُغَ مِنْ صَلاَتِهِ فَقَالَ مَنْ كَانَ ذَبَحَ أُضْحِيَّتَهُ قَبْلَ أَنْ يُصَلِّيَ أَوْ نُصَلِّيَ فَلْيَذْبَحْ مَكَانَهَا أُخْرَى وَمَنْ كَانَ لَمْ يَذْبَحْ فَلْيَذْبَحْ بِاسْمِ اللَّهِ  

I was with Messenger of Allah ﷺ (on the occasion) of 'Id al-Adha. After he had completed the prayer with people, he found that the goats had been slaughtered, whereupon he said: He who slaughtered sacrificial animal before the prayer should slaughter a goat (again) in its stead and he who has not slaughtered he should slaughter it by reciting the name of Allah.  

شَهِدْتُ الأَضْحَى مَعَ رَسُولِ اللَّهِ ﷺ فَلَمَّا قَضَى صَلاَتَهُ بِالنَّاسِ نَظَرَ إِلَى غَنَمٍ قَدْ ذُبِحَتْ فَقَالَ مَنْ ذَبَحَ قَبْلَ الصَّلاَةِ فَلْيَذْبَحْ شَاةً مَكَانَهَا وَمَنْ لَمْ يَكُنْ ذَبَحَ فَلْيَذْبَحْ عَلَى اسْمِ اللَّهِ  

“I was present on Adha day with the Messenger of Allah ﷺ, and some people slaughtered before the prayer. The Prophet ﷺ said: ‘Whoever among you has slaughtered before the prayer, let him repeat his sacrifice, and whoever has not, let him offer his sacrifice in the Name of Allah.’”  

أَنَّهُ سَمِعَهُ يَقُولُ شَهِدْتُ الأَضْحَى مَعَ رَسُولِ اللَّهِ ﷺ فَذَبَحَ أُنَاسٌ قَبْلَ الصَّلاَةِ فَقَالَ النَّبِيُّ ﷺ مَنْ كَانَ ذَبَحَ مِنْكُمْ قَبْلَ الصَّلاَةِ فَلْيُعِدْ أُضْحِيَّتَهُ وَمَنْ لاَ فَلْيَذْبَحْ عَلَى اسْمِ اللَّهِ  

[Machine] "He (referring to someone) prayed with the Messenger of Allah ﷺ on the day of Eid, and then the Messenger of Allah ﷺ left. Suddenly, he found meat and the sacrifices of Eid, so the Messenger of Allah ﷺ knew that they had been slaughtered before he prayed. So the Messenger of Allah ﷺ said, 'Whoever slaughtered before we prayed, let him slaughter another one in its place. And whoever did not slaughter until we prayed, let him slaughter in the name of Allah.'"  

أَنَّهُ صَلَّى مَعَ رَسُولِ اللهِ ﷺ يَوْمَ أَضْحَى فَانْصَرَفَ رَسُولُ اللهِ ﷺ فَإِذَا هُوَ بِاللَّحْمِ وَذَبَائِحِ الْأَضْحَى فَعَرَفَ رَسُولُ اللهِ ﷺ أَنَّهَا ذُبِحَتْ قَبْلَ أَنْ يُصَلِّيَ فَقَالَ رَسُولُ اللهِ ﷺ مَنْ كَانَ ذَبَحَ قَبْلَ أَنْ نُصَلِّيَ فَلْيَذْبَحْ مَكَانَهَا أُخْرَى وَمَنْ لَمْ يَكُنْ ذَبَحَ حَتَّى صَلَّيْنَا فَلْيَذْبَحْ بِاسْمِ اللهِ  

I was with Messenger of Allah ﷺ (on the occasion) of 'Id al-Adha. After he had completed the prayer with people, he found that the goats had been slaughtered, whereupon he said: He who slaughtered sacrificial animal before the prayer should slaughter a goat (again) in its stead and he who has not slaughtered he should slaughter it by reciting the name of Allah. (Using translation from Muslim 1960b)   

شَهِدْتُ أَضْحًى مَعَ رَسُولِ اللهِ ﷺ فَصَلَّى بِالنَّاسِ فَلَمَّا قَضَى رَسُولُ اللهِ ﷺ الصَّلَاةَ رَأَى غَنَمًا قَدْ ذُبِحَتْ فَقَالَ «مَنْ كَانَ ذَبَحَ قَبْلَ الصَّلَاةِ فَلْيَذْبَحْ شَاةٍ مَكَانَهَا وَمَنْ لَمْ يَكُنْ ذَبَحَ فَلْيَذْبَحْ بِاسْمِ اللهِ»  

[Machine] I witnessed the Eid sacrifice with the Prophet ﷺ , and he saw some people who had slaughtered their animals before the prayer. He said, "Whoever has already slaughtered their animal before the prayer should repeat the sacrifice, and whoever has not yet slaughtered should do so in the name of Allah."  

شَهِدْتُ الْأَضْحَى مَعَ النَّبِيِّ ﷺ فَرَأَى نَاسًا قَدْ ذَبَحُوا قَبْلَ الصَّلَاةِ فَقَالَ «مَنْ كَانَ ذَبَحَ قَبْلَ الصَّلَاةِ فَلْيُعِدِ الذَّبْحَ وَمَنْ لَمْ يَكُنْ ذَبَحَ فَلْيَذْبَحْ عَلَى اسْمِ اللهِ»