The eponymous protagonist of the biblical story of Ruth, a Moabite widow, is so desperate to follow her widowed mother-in-law back to Israel that she swears an oath. Regardless of the translation one may choose, the sense is the same: Ruth promises to stick by Naomi's side for at least as long as they both shall live. Ruth's intention with respect to the two widows' proximity once they cross the final river is not so unanimous in the translations,...