Sahih al-Bukhari 5562
Narrated Jundab bin Sufyan Al-Bajali:
I witnessed the Prophet (ﷺ) on the Day of Nahr. He said, "Whoever slaughtered the sacrifice before 
offering the `Id prayer, should slaughter another sacrifice in its place; and whoever has not slaughtered 
their sacrifice yet, should slaughter now."
حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا الأَسْوَدُ بْنُ قَيْسٍ، سَمِعْتُ جُنْدَبَ بْنَ سُفْيَانَ الْبَجَلِيَّ، قَالَ شَهِدْتُ النَّبِيَّ صلى الله عليه وسلم يَوْمَ النَّحْرِ فَقَالَ ‏
"‏ مَنْ ذَبَحَ قَبْلَ أَنْ يُصَلِّيَ فَلْيُعِدْ مَكَانَهَا أُخْرَى، وَمَنْ لَمْ يَذْبَحْ فَلْيَذْبَحْ ‏"‏‏.‏