﴿ وَإِن يُرِيدُوا۟ خِيَانَتَكَ فَقَدْ خَانُوا۟ ٱللَّهَ مِن قَبْلُ فَأَمْكَنَ مِنْهُمْ ۗ وَٱللَّهُ عَلِيمٌ حَكِيمٌ ﴾

“And should they but seek to play false with thee -well, they were false to God [Himself] ere this: but He gave [the believers] mastery over them. And God is all-knowing, wise.”

And if they the captives desire to betray you through words which they speak to you they have betrayed God before before Badr through unbelief; but He has given you power over them at Badr through slaying and capture so let them anticipate the like if they return to betrayal; and God is Knower of His creatures Wise in His actions.