«من ضحى قبل الصلاة فإنما ذبح لنفسه ومن ذبح بعد الصلاة فقد تم نسكه وأصاب سنة المسلمين»
The Prophet (peace and blessings be upon him) said:
"Whoever offers his sacrifice before the prayer has only slaughtered for himself; and whoever slaughters after the prayer, his sacrifice is complete and he has attained the way of the Muslims."
Hadith Referenceصحیح الجامع الصغیر / حرف الميم / 6373