First Executive Order on the Civil Status Law issued by the Minister of Justice [Germany]: “Article 2 – (b) Jews may not act as a witness at a wedding when the couple, who are to be married, are German nationals, of German or kindred blood as well as of second-degree mixed-blood. Berlin 19 Mai 1938 – The Minister of Justice, signed by Schlegelberger.”
1938 Reichsgesetzblatt I, page 538. Accessed online; Translated by Franziska Wagener 2/1/2016