al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
[وجوب الهجرة :] وَالْهِجْرَةُ قَائِمَةٌ عَلَى حَدِّهَا الاْوَّلِ، مَا كَانَ لله تعالى فِي أَهْلِ الاْرْضِ حَاجَةٌ مِنْ مُسْتَسِرِّ الاْمَّةِ وَمُعْلِنِهَا، لاَ يَقَعُ اسْمُ الْهِجْرَةِ عَلَى أَحَد إلاَّ بِمَعْرِفَةِ الْحُجَّةِ في الاْرْضِ، فَمَنْ عَرَفَهَا وَأَقَرَّ بِهَا فَهُوَ مُهَاجِرٌ، وَلاَ يَقَعُ اسْمُ الاسْتِضْعَافِ عَلَى مَنْ بَلَغَتْهُ الْحُجَّةُ فَسَمِعَتْهَا أُذُنُهُ وَوَعَاهَا قَلْبُهُ.
[The obligation of migration :] And immigration stands as its original position. Allāh has no need towards him who secretly accepts belief or him who openly does so. Immigration will not apply to any one unless he recognizes the proof (of Allāh) on the earth. Whoever reco nizes him and acknowledges him would be a muhājir (immigrant). istiḍ‘āf (i.e. freedom from the obligation of immigration) does not apply to him whom the proof (of Allāh) reaches and he hears it and his heart preserves it. [1]
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