משנה אויף דברים 20:8

“Then the officers shall go on addressing the troops and say, ‘Is there anyone afraid and disheartened’” (Deuteronomy 20:8).Rabbi Akiva says: “afraid and disheartened” is to be understood literally, that he cannot stand in the battle lines and see a drawn sword. Rabbi Yose the Galilean says: “afraid and disheartened” this is the one who is afraid because of the transgressions he has committed; therefore the Torah connected all these [other categories of those who return home] with him that he may return home on their account. Rabbi Yose says: a high priest who married a widow, an ordinary priest who married a divorcee or halutzah, an Israelite who married a mamzeret or netinah, and the daughter of an Israelite who married a mamzer or a natin behold this one is “afraid and disheartened.”