Deuteronomy 7:3 Neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son.
Joshua 23:12 Else, if ye do in any wise go back, and cleave unto the remnant of these nations, even these that remain among you, and shall make marriages with them, and go in unto them, and they to you;
Ezra 10:Intro Strange marriages -- The people repent.
DC 111:1a According to the custom of all civilized nations, marriage is regulated by laws and ceremonies:
DC 111:2d "May God add his blessings and keep you to fulfill your covenants from henceforth and for ever. Amen."
