Al-Bara’ reported God’s Messenger as saying, “If anyone sacrifices before the prayer, he is sacrificing only for himself; but if anyone sacrifices after the prayer, his rites are complete and he has correctly followed the practice of the Muslims." (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب الصلاة / 1437
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (5546) و مسلم (1961/4)»