Hadith 8:3025
Abu Bakr narrated to us, he said: Abu Khalid narrated to us, from Ash'ath, from whoever mentioned it, from Ibn Abbas, he said: When he saw a man slaughtering his sacrificial camel while it was kneeling, [he said]: "The Sunnah of Muhammad, may Allah bless him and grant him peace, is [to slaughter it] while it is standing."
حدثنا أبو بكر قال نا أبو خالد عن أشعث عن من يذكر عن بن عباس قال لما رأى رجلا ينحر بدنته باركة قياما سنة محمد صلى الله عليه وسلم