﴿ ۞ وَمَا كَانَ ٱلْمُؤْمِنُونَ لِيَنفِرُوا۟ كَآفَّةًۭ ۚ فَلَوْلَا نَفَرَ مِن كُلِّ فِرْقَةٍۢ مِّنْهُمْ طَآئِفَةٌۭ لِّيَتَفَقَّهُوا۟ فِى ٱلدِّينِ وَلِيُنذِرُوا۟ قَوْمَهُمْ إِذَا رَجَعُوٓا۟ إِلَيْهِمْ لَعَلَّهُمْ يَحْذَرُونَ ﴾

“With all this, it is not desirable that all of the believers take the field [in time of war]. From within every group in their midst, some shall refrain from going forth to war, and shall devote themselves [instead] to acquiring a deeper knowledge of the Faith. and [thus be able to] teach their home-coming brethren, so that these [too] might guard themselves against evil.”

When the Prophet s was about to dispatch a raiding party — after they certain Muslims had been reproached for staying behind — all of them went forth and so the following was revealed It is not for the believers to go forth on a raid altogether why should not a party a group of every section of every tribe of them go forth while the others remain behind so that they those who remain behind may become learned in religion and that they may warn their folk when they return to them from the raid by teaching them some of the rulings which they have come to learn so that they may beware? of God’s punishment by adhering to His commands and prohibitions. Ibn ‘Abbās said that this verse is specifically intended for raiding parties while the previous one is specifically to prohibit any individual staying behind when the Prophet s sets out on a campaign.