وَمَا كَانَ الْمُؤْمِنُونَ لِیَنْفِرُوا كَٓافَّةًؕ فَلَوْلَا نَفَرَ مِنْ كُلِّ فِرْقَةٍ مِنْهُمْ طَٓائِفَةٌ لِیَتَفَقَّهُوا فِی الدّٖینِ وَلِیُنْذِرُوا قَوْمَهُمْ اِذَا رَجَعُٓوا اِلَیْهِمْ لَعَلَّهُمْ یَحْذَرُونَࣖ
Wama kana almuminoona liyanfiroo kaffatan falawla nafara min kulli firqatin minhum taifatun liyatafaqqahoo fee alddeeni waliyunthiroo qawmahum itha rajaAAoo ilayhim laAAallahum yahtharoona
Translations
And it is not for the believers to go forth [to battle] all at once. For there should separate from every division of them a group [remaining] to obtain understanding in the religion and warn their people when they return to them that they might be cautious
Saheeh International
And the believers should not all go out to fight. Of every troop of them, a party only should go forth, that they (who are left behind) may gain sound knowledge in religion, and that they may warn their folk when they return to them, so that they may beware
Marmaduke Pickthall