respond in kind

وَإِمَّا تَخَافَنَّ مِن قَوْمٍ خِيَانَةً فَٱنۢبِذْ إِلَيْهِمْ عَلَىٰ سَوَآءٍ ۚ إِنَّ ٱللَّهَ لَا يُحِبُّ ٱلْخَآئِنِينَ

And if you learn of treachery on the part of any people, throw their treaty back at them, for God does not love the treacherous.

وَإِنْ عَاقَبْتُمْ فَعَاقِبُوا۟ بِمِثْلِ مَا عُوقِبْتُم بِهِۦ ۖ وَلَئِن صَبَرْتُمْ لَهُوَ خَيْرٌ لِّلصَّـٰبِرِينَ

If you [believers] have to respond to an attack, make your response proportionate, but it is best to stand fast.