Quran english at taubah 122
وما كان المؤمنون لينفروا كافة فلولا نفر من كل فرقة منهم طائفة ليتفقهوا في الدين ولينذروا قومهم إذا رجعوا إليهم لعلهم يحذرون
Wama kana almu/minoonaliyanfiroo kaffatan falawla nafara min kullifirqatin minhum ta-ifatun liyatafaqqahoo fee addeeniwaliyunthiroo qawmahum itha rajaAAoo ilayhimlaAAallahum yahtharoon
Sahih International
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.
Muhsin Khan
And it is not (proper) for the believers to go out to fight (Jihad) all together. Of every troop of them, a party only should go forth, that they (who are left behind) may get instructions in (Islamic) religion, and that they may warn their people when they return to them, so that they may beware (of evil).
Pickthall
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.
Yusuf Ali
Nor should the Believers all go forth together: if a contingent from every expedition remained behind, they could devote themselves to studies in religion, and admonish the people when they return to them,- that thus they (may learn) to guard themselves (against evil).
Shakir
And it does not beseem the believers that they should go forth all together; why should not then a company from every party from among them go forth that they may apply themselves to obtain understanding in religion, and that they may warn their people when they come back to them that they may be cautious?
Dr. Ghali
And in no way should the believers march out, as a whole; so, had only a section of every grouping marched out, (another section would have stayed) to comprehend for themselves in the religion, (i.e., to study the religion) and to warn their people when they return to them, that possibly they would beware.