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