Bukhari and Muslim contain a tradition from Hadrat Sa’id bin Jubair to the effect “When I asked Hadrat Abdullah bin Abbas about Surah Al-Hashr, he replied that it was sent down concerning the battle against the Bani an-Nadir just as Surah Al-Anfal was sent down concerning the Battle of Badr. In another tradition from Hadrat Sa’id bin Jubair, the words cited from Ibn Abbas (may Allah be pleased with him) are: Qul: Surah an-Nadir: Say, it is Surah an-Nadir.” The same thing has been related also from Mujahid, Qatadah, Zuhri, Ibn Zaid, Yazid bin Ruman, Muhammad bin Ishaq and others. They are unanimous that the followers of the Book whose banishment has been mentioned in it, imply the Bani an-Nadir. Yazid bin Ruman, Mujahid and Muhammad bin Ishaq have stated that this whole Surah, from beginning to end, came down concerning this very battle.
As for the question as to when this battle took place, Imam Zuhri has stated on the authority of Urwah bin Zubair that it took place six months after the Battle of Badr. However, Ibn Sa’d, Ibn Hisham and Baladhuri regard it as an event of Rabi’ al-Awwal, A. H. 4, and the same is correct. For all traditions agree that this battle took place after the incident of Bi’r Ma’unah, and historically also it is well known that the incident of Bir Ma’unah occurred after the Battle of Uhud and not before it.
As for the question as to when this battle took place, Imam Zuhri has stated on the authority of Urwah bin Zubair that it took place six months after the Battle of Badr. However, Ibn Sa’d, Ibn Hisham and Baladhuri regard it as an event of Rabi’ al-Awwal, A. H. 4, and the same is correct. For all traditions agree that this battle took place after the incident of Bi’r Ma’unah, and historically also it is well known that the incident of Bir Ma’unah occurred after the Battle of Uhud and not before it.