عَنْ جَابِرٍ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ إِنَّ الْعَشْرَ عَشْرُ الْأَضْحَى وَالْوِتْرَ يَوْمُ عَرَفَةَ وَالشَّفْعَ يَوْمُ النَّحْرِ
It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him and his family) said: By the ten nights is meant the first ten nights of the month of Eid al-Adha, by the odd (witr) is meant the day of Arafat, and by the even (shaf‘) is meant the day of sacrifice.