"If Zoroastrian and idolatrous women are taken prisoner, they are coerced into Islam; if they embrace it, sexual relations with them are permissible and they can (also) be used as maidservants. If they do not embrace Islam, they are used as maidservants but not for sexual relations."
January 1, 1970
https://en.wikiquote.org/wiki/Ahmad_ibn_Hanbal