Abu Bakr, on the day of Nahr (i.e. slaughtering of animals for sacrifice), sent me in the company of others to make this announcement: "After this year, no pagan will be allowed to perform the Hajj, and none will be allowed to perform the Tawaf of the Kaʿba undressed." And the day of Al-Hajj-ul-Akbar is the day of Nahr, and it called Al-Akbar because the people call the ʿUmra Al-Hajj-ul-Asghar (i.e. the minor Hajj). Abu Bakr threw back the pagans' covenant that year, and therefore, no pagan performed the Hajj in the year of Hajj-ul-Wadaʿ of the Prophets.  

بَعَثَنِي أَبُو بَكْرٍ ؓ فِيمَنْ يُؤَذِّنُ يَوْمَ النَّحْرِ بِمِنًى لاَ يَحُجُّ بَعْدَ الْعَامِ مُشْرِكٌ وَلاَ يَطُوفُ بِالْبَيْتِ عُرْيَانٌ وَيَوْمُ الْحَجِّ الأَكْبَرِ يَوْمُ النَّحْرِ وَإِنَّمَا قِيلَ الأَكْبَرُ مِنْ أَجْلِ قَوْلِ النَّاسِ الْحَجُّ الأَصْغَرُ فَنَبَذَ أَبُو بَكْرٍ إِلَى النَّاسِ فِي ذَلِكَ الْعَامِ فَلَمْ يَحُجَّ عَامَ حَجَّةِ الْوَدَاعِ الَّذِي حَجَّ فِيهِ النَّبِيُّ ﷺ مُشْرِكٌ