Allah سبحانه وتعالى Almighty revealed to His Prophet صلى الله عليه وعلى آله وسلم : "When you ˹O’ Prophet˺ are ˹campaigning˺ with them and you lead them in prayer, let one group of them pray with you - while armed. When they prostrate themselves, let the other group stand guard behind them. Then the group that has not yet prayed will then join you in prayer - and let them be vigilant and armed. The disbelievers would wish to see you neglect your weapons and belongings, so they could launch a sweeping assault on you. But there is no blame if you lay aside your weapons when overcome by heavy rain or illness - but take precaution. Indeed, Allah سبحانه وتعالى has prepared a humiliating punishment for the disbelievers. When the prayers are over, remember Allah سبحانه وتعالى - whether you are standing, sitting, or lying down. But when you are secure, establish regular prayers. Indeed, performing prayers is a duty on the believers at the appointed times." (Surah An-Nisa 4:102-103). This is the prayer of fear that Allah سبحانه وتعالى, Blessed and Exalted, commanded His Prophet صلى الله عليه وعلى آله وسلم to perform.