The magistrate, before whom an examination has taken place upon a criminal accusation, shall certify to all the proceedings had before him, as well as where he discharges, holds to bail or commits, and transmit them, sealed up, to the court before which the defendant may be tried, writing his name across the seals of the envelope. The voluntary statement of the defendant, the testimony, bail bonds, and every other proceeding in the case, shall be thus delivered to the clerk of the proper court, without delay.