﴿ مَا كَانَ لِنَبِىٍّ أَن يَكُونَ لَهُۥٓ أَسْرَىٰ حَتَّىٰ يُثْخِنَ فِى ٱلْأَرْضِ ۚ تُرِيدُونَ عَرَضَ ٱلدُّنْيَا وَٱللَّهُ يُرِيدُ ٱلْءَاخِرَةَ ۗ وَٱللَّهُ عَزِيزٌ حَكِيمٌۭ ﴾

“IT DOES NOT behove a prophet to keep captives unless he has battled strenuously on earth. You may desire the fleeting gains of this world-but God desires [for you the good of] the life to come: and God is almighty, wise.”

Please check ayah 8:69 for complete tafsir.