3 Do not intermarry with them. Do not give your daughters to their sons or take their daughters for your sons,

Read Deuteronomy 7:3 Using Other Translations

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.
You shall not intermarry with them, giving your daughters to their sons or taking their daughters for your sons,
You must not intermarry with them. Do not let your daughters and sons marry their sons and daughters,