When you approach the battle, the kohen shall come near, and speak to the people. And he shall say to them: "Hear, O Israel, today you are approaching the battle against your enemies. Let your hearts not be faint; you shall not be afraid, and you shall not be alarmed, and you shall not be terrified because of them. For the L-rd, your G-d, is the One Who goes with you, to fight for you against your enemies, to save you..."
— Deuteronomy 20:2-4