Except those who are (really) weak and oppressed - men, women, and children - who have no means in their power, nor (a guide-post) to their way. An-Nisa 4:98 ⧉
Tafsir:
A believer naturally wants a free environment where his believing personality may find full opportunities to express itself. If he finds the environment unfavourable, he had better change his surroundings. This change of place is called hijrah (emigration). Thus, in the real spirit of hijrah, one should remove oneself from an unfavourable to a favourable situation. Let us take the example of a person who is associated with an organisation which is dominated by certain personalities. He realises that he may exist there only as a glorifier of those personalities and not as a glorifier of God. Now, if for the sake of self-interest he compromises with that atmosphere and fails to proclaim the truth as he sees it, and then, still in the same state, he breathes his last, it might be said that in that case, he had perpetrated an injustice against his soul.