Surah At-Taubah Verse 122 - English Translation by Mufti Taqi Usmani
Surah At-Taubah۞وَمَا كَانَ ٱلۡمُؤۡمِنُونَ لِيَنفِرُواْ كَآفَّةٗۚ فَلَوۡلَا نَفَرَ مِن كُلِّ فِرۡقَةٖ مِّنۡهُمۡ طَآئِفَةٞ لِّيَتَفَقَّهُواْ فِي ٱلدِّينِ وَلِيُنذِرُواْ قَوۡمَهُمۡ إِذَا رَجَعُوٓاْ إِلَيۡهِمۡ لَعَلَّهُمۡ يَحۡذَرُونَ
It is not (necessary) for all the believers to go forth.’; So, why should it not be that a group from every section of them goes forth, so that they may acquire perfect understanding of the Faith, and so that they may warn their people when they return to them, so that they may take due care (of the rules of Sharī‘ah)