Al-Hajjaj went to Ibn `Umar while I was present there. Al-Hajjaj asked Ibn `Umar, "How are you?" Ibn `Umar replied, "I am all right," Al-Hajjaj asked, "Who wounded you?" Ibn `Umar replied, "The person who allowed arms to be carried on the day on which it was forbidden to carry them (he meant Al-Hajjaj)."
Sahih al-Bukhari Book 13, Hadith 16
← Previous Hadith I was with Ibn `Umar when a spear head pierced the sole of his foot and his foot stuck to the paddle of the saddle and I got down and pulled his foot out, and that happened in Mina. Al-Hajjaj got the news and came to inquire about his health and said, "Alas! If we could only know the man who wounded you!" Ibn `Umar said, "You are the one who wounded me." Al-Hajjaj said, "How is that?" Ibn `Umar said, "You have allowed the arms to be carried on a day on which nobody used to carry them and you allowed arms to be carried in the Haram even though it was not allowed before."

Sahih al-Bukhari Book 13, Hadith 15 Next Hadith → The Prophet (ﷺ) delivered the Khutba on the day of Nahr (`Id-ul-Adha) and said, "The first thing we should do on this day of ours is to pray and then return and slaughter (our sacrifices). So anyone who does so he acted according to our Sunna; and whoever slaughtered before the prayer then it was just meat that he offered to his family and would not be considered as a sacrifice in any way. My uncle Abu Burda bin Niyyar got up and said, "O, Allah's Messenger (ﷺ)! I slaughtered the sacrifice before the prayer but I have a young she-goat which is better than an older sheep." The Prophet (ﷺ) said, "Slaughter it in lieu of the first and such a goat will not be considered as a sacrifice for anybody else after you."

Sahih al-Bukhari Book 13, Hadith 17