(4) Prayer
كتاب الصلاة
(48a) Chapter: The Prayer at the two Festivals - Section 1
(47) باب صلاة العيدين - الفصل الأول
Mishkat al-Masabih 1437 
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.)
وَعَنِ الْبَرَاءِ قَالَ: قَالَ رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ ذَبَحَ قَبْلَ الصَّلَاةِ فَإِنَّمَا يَذْبَحُ لِنَفْسِهِ وَمَنْ ذَبَحَ بَعْدَ الصَّلَاةِ فَقَدْ تَمَّ نُسُكُهُ وَأَصَابَ سُنَّةَ الْمُسلمين»
 مُتَّفَقٌ عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 1437
In-book reference : Book 4, Hadith 838