Yevamos 76b-77b
As descendants from Ruth the Moabitess and Na'amah the Amonitess, why is the Davidic monarchy legitimate? \u2022 What is the quintessential trait of King David and his royal line? \u2022 What differentiates the sword of Esau from the scimitar of Yishmael? \u2022 May the daughter of an Amonite convert and an Israelite woman marry a Kohen? \u2022 May the daughter of a gentile and an Israelite woman marry a Kohen?