from a man among the children of Umm Salamah, from Umm Salamah that she said: "O Messenger of Allah! I have not heard Allah mentioning anything about women and emigration." So Allah, Blessed and Most High, revealed: "Never will I allow to be lost the work of any of you, be he male or female. You are members one of another (3:195)."  

يَا رَسُولَ اللَّهِ لاَ أَسْمَعُ اللَّهَ ذَكَرَ النِّسَاءَ فِي الْهِجْرَةِ فَأَنْزَلَ اللَّهُ تَعَالَى ( إِنِّي لاَ أُضِيعُ عَمَلَ عَامِلٍ مِنْكُمْ مِنْ ذَكَرٍ أَوْ أُنْثَى بَعْضُكُمْ مِنْ بَعْضٍ )  

[Machine] I said, "O Messenger of Allah, I have not heard Allah mention women in relation to migration." So Allah revealed, "Indeed, I do not allow to be lost the work of any worker, male or female."  

قُلْتُ يَا رَسُولَ اللهِ لَمْ أَسْمَعِ اللهَ ذَكَرَ النِّسَاءَ فِي الْهِجْرَةِ فَأَنْزَلَ اللهُ {أَنِّي لَا أُضِيعُ عَمَلَ عَامِلٍ مِنْكُمْ مِنْ ذَكَرٍ أَوْ أُنْثَى}