English Translation
Narrated Jundab bin Sufyan Al-Bajali: I witnessed the Prophet 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."
This hadith is from Sahih al-Bukhari, the most rigorously authenticated collection in Islamic scholarship. No editorial opinion is added.