Surah An-Nisa, ayah 102

وَإِذَا كُنتَ فِيهِمۡ فَأَقَمۡتَ لَهُمُ ٱلصَّلَوٰةَ فَلۡتَقُمۡ طَآئِفَةٞ مِّنۡهُم مَّعَكَ وَلۡيَأۡخُذُوٓاْ أَسۡلِحَتَهُمۡۖ فَإِذَا سَجَدُواْ فَلۡيَكُونُواْ مِن وَرَآئِكُمۡ وَلۡتَأۡتِ طَآئِفَةٌ أُخۡرَىٰ لَمۡ يُصَلُّواْ فَلۡيُصَلُّواْ مَعَكَ وَلۡيَأۡخُذُواْ حِذۡرَهُمۡ وَأَسۡلِحَتَهُمۡۗ وَدَّ ٱلَّذِينَ كَفَرُواْ لَوۡ تَغۡفُلُونَ عَنۡ أَسۡلِحَتِكُمۡ وَأَمۡتِعَتِكُمۡ فَيَمِيلُونَ عَلَيۡكُم مَّيۡلَةٗ وَٰحِدَةٗۚ وَلَا جُنَاحَ عَلَيۡكُمۡ إِن كَانَ بِكُمۡ أَذٗى مِّن مَّطَرٍ أَوۡ كُنتُم مَّرۡضَىٰٓ أَن تَضَعُوٓاْ أَسۡلِحَتَكُمۡۖ وَخُذُواْ حِذۡرَكُمۡۗ إِنَّ ٱللَّهَ أَعَدَّ لِلۡكَٰفِرِينَ عَذَابٗا مُّهِينٗا ١٠٢

Wa idhā kunta fīhim fa aqamta lahumus-salawāta faltaqum tā'ifatum minhum ma'aka walya'khudhū aslihatahum fa idhā sajadū falyakūnū min warā'ikum walta'ti tā'ifatun ukhrā lam yusallū falyusallū ma'aka walya'khudhū hidhrahum wa aslihatahum waddal-ladhīna kafarū law taghfulūna 'an aslihatikum wa amti'atikum fayamīlūna 'alaykum maylatan wāhidatan walā junāha 'alaykum in kāna bikum adham mim matarin aw kuntum mardā an tada'ū aslihatakum wakhudhū hidhrakum innallāha a'adda lil-kāfirīna 'adhābam muhīnā

And when you [i.e., the commander of an army] are among them and lead them in prayer,²¹⁷ let a group of them stand [in prayer] with you and let them carry their arms. And when they have prostrated, let them be [in position] behind you and have the other group come forward which has not [yet] prayed and let them pray with you, taking precaution and carrying their arms. Those who disbelieve wish that you would neglect your weapons and your baggage so they could come down upon you in one [single] attack. But there is no blame upon you, if you are troubled by rain or are ill, for putting down your arms, but take precaution. Indeed, Allāh has prepared for the disbelievers a humiliating punishment.