A party of the followers of the Book desire that they should lead you astray, and they lead not astray but themselves, and they do not perceive.

And when you are among them and keep up the prayer for them, let a party of them stand up with you, and let them take their arms; then when they have prostrated themselves let them go to your rear, and let another party who have not prayed come forward and pray with you, and let them take their precautions and their arms; (for) those who disbelieve desire that you may be careless of your arms and your luggage, so that they may then turn upon you with a sudden united attack, and there is no blame on you, if you are annoyed with rain or if you are sick, that you lay down your arms, and take your precautions; surely Allah has prepared a disgraceful chastisement for the unbelievers.

And when Allah promised you one of the two parties that it shall be yours and you loved that the one not armed should he yours and Allah desired to manifest the truth of what was true by His words and to cut off the root of the unbelievers.