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