وَأَذَانٌ مِّنَ اللَّهِ وَرَسُولِهِ إِلَى النَّاسِ يَوْمَ الْحَجِّ الْأَكْبَرِ أَنَّ اللَّهَ بَرِيءٌ مِّنَ الْمُشْرِكِينَ ۙ وَرَسُولُهُ ۚ فَإِن تُبْتُمْ فَهُوَ خَيْرٌ لَّكُمْ ۖ وَإِن تَوَلَّيْتُمْ فَاعْلَمُوا أَنَّكُمْ غَيْرُ مُعْجِزِي اللَّهِ ۗ وَبَشِّرِ الَّذِينَ كَفَرُوا بِعَذَابٍ أَلِيمٍ (3)
(9:3) This is a public proclamation from Allah and His Messenger for all the people on the Day of Great Haj: *4 Allah is free from the treaty obligations made with the mushriks and so is His Messenger. If, therefore, you repent now, it is better for you but if you turn away, you should know it well that you cannot frustrate (the Will ofAllah. And, O Prophet, give the good news of a painful chastisement to the rejecters
*4) Hajj-i-akbar refers to the 10th of Zil-Hajjah and is also known as Yaum-un-Nahr. This has been explained by the Holy Prophet in an authentic Tradition. On the 10th of Zil-Hajjah, during the last Haj of the Holy Prophet, he asked the people, "What is this day?" The people answered, "It is the day of Sacrifice. "
The Holy Prophet said, "This is the day of Hajj-i-akbar" Here the word Hajj-i-akbar (Great Pilgrimage) has been used in contrast to Hajj-i-asghar which the Arabs used for 'Umrah' . Thus, the Haj which is performed in the prescribed dates of Zil-Haj is called Hajj-i-akbar.