The Mishnah (Kiddushin 3:12) states that, to be a Jew, one must be either the child of a Jewish mother or a convert to Judaism, (ger tzedek, "righteous convert"). The Talmud (Kiddushin 68b) derives this law from the Torah, specifically Deuteronomy 7:3-4: "Thy daughter thou shalt not give to his son, nor shalt thou take his daughter to thy son. For they will turn away thy son from following me, that they may serve other gods." This rule was clearly accepted by the 2nd century CE, with virtually no debate over it appearing in the Talmud. Orthodox opinion regards this rule as dating from receipt of the Torah at Mount Sinai, but most non-Orthodox scholars regard it as originating either at the time of Ezra (4th Century BCE) or during the period of Roman rule in the 1st-2nd centuries CE.