protect them unless they under a regime with whom you have a covenant

إِنَّ ٱلَّذِينَ ءَامَنُوا۟ وَهَاجَرُوا۟ وَجَـٰهَدُوا۟ بِأَمْوَٰلِهِمْ وَأَنفُسِهِمْ فِى سَبِيلِ ٱللَّهِ وَٱلَّذِينَ ءَاوَوا۟ وَّنَصَرُوٓا۟ أُو۟لَـٰٓئِكَ بَعْضُهُمْ أَوْلِيَآءُ بَعْضٍ ۚ وَٱلَّذِينَ ءَامَنُوا۟ وَلَمْ يُهَاجِرُوا۟ مَا لَكُم مِّن وَلَـٰيَتِهِم مِّن شَىْءٍ حَتَّىٰ يُهَاجِرُوا۟ ۚ وَإِنِ ٱسْتَنصَرُوكُمْ فِى ٱلدِّينِ فَعَلَيْكُمُ ٱلنَّصْرُ إِلَّا عَلَىٰ قَوْمٍۭ بَيْنَكُمْ وَبَيْنَهُم مِّيثَـٰقٌ ۗ وَٱللَّهُ بِمَا تَعْمَلُونَ بَصِيرٌ

Those who believed and emigrated [to Medina] and struggled for God’s cause with their possessions and persons, and those who gave refuge and help, are all allies of one another. As for those who believed but did not emigrate, you are not responsible for their protection until they have done so. But if they seek help from you against persecution, it is your duty to assist them, except against people with whom you have a treaty: God sees all that you do.