Rashi on Deuteronomy 20:7/רש"י על דברים כ׳:ז׳

1פן ימות במלחמה [LET HIM GO AND RETURN] LEST HE DIE IN THE WAR — The meaning is: let him return so that he not die, for if he will not hearken to the words of the priests he deserves death (Sifrei Devarim 194:5).