Surat Tawbah (26-27)

{ثُمَّ أَنَزلَ اللّهُ سَكِينَتَهُ عَلَى رَسُولِهِ وَعَلَى الْمُؤْمِنِينَ وَأَنزَلَ جُنُوداً لَّمْ تَرَوْهَا وَعذَّبَ الَّذِينَ كَفَرُواْ وَذَلِكَ جَزَاء الْكَافِرِينَ} [التوبة: 26]

26- Then Allah sent down His Mercy and Security, after the defeat, on His Messenger and the Mujahedeen and sent down angels whom you did not see to encourage and strengthen Muslims and to cast horror in the hearts of polytheists. Verily, Allah tortured those who disbelieved by killing and capturing their children and seizing their money, and that was only part of the punishment of those who loved disbelief and fought Allah and His Messenger.

{ثُمَّ يَتُوبُ اللّهُ مِن بَعْدِ ذَلِكَ عَلَى مَن يَشَاءُ وَاللّهُ غَفُورٌ رَّحِيمٌ} [التوبة: 27]

27- Then Allah accepted the repentance of whomever He willed after He had made them taste the humiliation of defeat by guiding them to Islam. Indeed, Allah forgives their previous actions of disbelief and war and shall reward them for their good actions.

Then Hawazen came to the Messenger of Allah and embraced Islam, accordingly he gave them back 6000 captives and honored whomever he wants from them by gifts to attract their hearts to Islam and appointed one of them to be their leader.