إِنَّ الَّذِينَ آمَنُواْ وَهَاجَرُواْ وَجَاهَدُواْ بِأَمْوَالِهِمْ وَأَنفُسِهِمْ فِي سَبِيلِ اللّهِ وَالَّذِينَ آوَواْ وَّنَصَرُواْ أُوْلَئِكَ بَعْضُهُمْ أَوْلِيَاء بَعْضٍ وَالَّذِينَ آمَنُواْ وَلَمْ يُهَاجِرُواْ مَا لَكُم مِّن وَلاَيَتِهِم مِّن شَيْءٍ حَتَّى يُهَاجِرُواْ وَإِنِ اسْتَنصَرُوكُمْ فِي الدِّينِ فَعَلَيْكُمُ النَّصْرُ إِلاَّ عَلَى قَوْمٍ بَيْنَكُمْ وَبَيْنَهُم مِّيثَاقٌ وَاللّهُ بِمَا تَعْمَلُونَ بَصِيرٌ
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سورة الأنفال
(8/72) Verily those who believed (who wished to reach Allah before death) and emigrated and struggle on the Way of Allah with their property and their souls (lives) in the Way of Allah and those who gave shelter and helped (them), these are friends of one another. And you owe no duty of protection to them until they emigrate. But if they seek your help in religion, it is your duty to help them except against a people with whom you have a covenant (a treaty). And Allah is All-Seeing of what you do.
Surah Al-Anfal