Permission [to fight] has been given to those who are being fought, (22:39)

Almuntakhab Fi Tafsir Alquran Alkarim

Those who have been attacked by the infidels who waged war against them for their belief in Allah are permitted to fight in defense of the wrong inflicted on them; Allah is indeed Qadirun (Omnipotent) enough to afford them help

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(22:39) Permission (to fight) has been granted to those against whom war has been waged because they have been treated unjustly, *78 and Allah is certainly able to help them. *79

Permission [to fight] has been given to those who are being fought, meaning

*78) This (v. 39) is the first verse of the Qur'an in which permission to tight was given in the month of Zil-Hajj in the first year after Hijrah according to our research. Then the command to fight was given in vv. 190, 191, 193, 216 and 244 of Chapter II (Al-Baqarah) in Rajab or Sha`ban of A.H. 2.
*79) ".....and Allah is certainly able to help them": this assurance was urgently needed by the persecuted Muslims whose fighting strength at that time was very meagre-not even a thousand including all the migrants and the Muslims of al-Madinah. On the other hand, the fighting strength of the Quraish by themselves was much greater. Besides, they had all the other mushrik clans of Arabia at their back and were joined later by the Jews as well. Therefore, this assurance was most opportune and the challenge to the disbelievers was very significant, for itmeant to say that they were not fighting against a small number of the Muslims but against Allah. Therefore, "You are. welcome to fight if you dare". '
 

Permission [to fight] has been given to those who are being fought, meaning in Urdu

اجازت دے دی گئی اُن لوگوں کو جن کے خلاف جنگ کی جا رہی ہے، کیونکہ وہ مظلوم ہیں، اور اللہ یقیناً ان کی مدد پر قادر ہے