It wasnarrated from 'Uwaimir bin Ashqar that he slaughtered beforetheprayer, and he mentioned that to the Prophet (ﷺ) who said:
"Repeatyour sacrifice." (JA)
English reference (JA): Vol. 4, Book 26, Hadith 3153 (JA)
Arabic reference (JA): Book 26, Hadith 3273 (JA)