Israel's Law of Return stipulates that a Jew is someone with a Jewish mother or someone who has converted to Judaism and is not a member of another religion. The Israeli Chief Rabbinate requires documents proving the Jewishness of one’s mother, grandmother, great-grandmother and great-great-grandmother when applying for marriage. The Office of the Chief Rabbi (OCR) has underlined the basic principle that a child is not recognised by the OCR and other bodies as Jewish unless their mother is Jewish, or they underwent a conversion recognized by the body.