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Surah 9. Al-Tawba
Ayah 3 - 4
3 وَأَذَٰنٌ مِّنَ ٱللَّهِ وَرَسُولِهِۦٓ إِلَى ٱلنَّاسِ يَوْمَ ٱلْحَجِّ ٱلْأَكْبَرِ أَنَّ ٱللَّهَ بَرِىٓءٌ مِّنَ ٱلْمُشْرِكِينَ ۙ وَرَسُولُهُۥ ۚ فَإِن تُبْتُمْ فَهُوَ خَيْرٌ لَّكُمْ ۖ وَإِن تَوَلَّيْتُمْ فَٱعْلَمُوٓا۟ أَنَّكُمْ غَيْرُ مُعْجِزِى ٱللَّهِ ۗ وَبَشِّرِ ٱلَّذِينَ كَفَرُوا۟ بِعَذَابٍ أَلِيمٍ
4 إِلَّا ٱلَّذِينَ عَـٰهَدتُّم مِّنَ ٱلْمُشْرِكِينَ ثُمَّ لَمْ يَنقُصُوكُمْ شَيْـًٔا وَلَمْ يُظَـٰهِرُوا۟ عَلَيْكُمْ أَحَدًا فَأَتِمُّوٓا۟ إِلَيْهِمْ عَهْدَهُمْ إِلَىٰ مُدَّتِهِمْ ۚ إِنَّ ٱللَّهَ يُحِبُّ ٱلْمُتَّقِينَ
[3-4] 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 of) Allah. And, O Prophet, give the good news of a painful chastisement to the rejecters excepting those mushriks with whom you made treaties. and who afterwards did not violate these in the least nor did they give help to anyone against you; so you also should observe the treaties with such people in accordance with their terms, for Allah loves the pious people.5
4Hajj-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.
5"......you also should observe the treaties with such people" who do not violate them, for your violation in such cases shall be against piety. And Muslims should remain pious under all circumstances "for Allah loves the pious people" only.