18-4-18. Proof of instrument by subscribing witness.
If proof of the execution of an instrument is made by a subscribing witness, such witness must be personally known to the officer taking the proof to be the person whose name is subscribed to the instrument as a witness or must be proved to be such by the oath of a credible witness. The subscribing witness must prove that the person whose name is subscribed to the instrument as a party is the person described in it and that such person executed it and that the witness subscribed his name thereto as a witness.
Source: CivC 1877, §662; CL 1887, §3284; RCivC 1903, §977; RC 1919, §583; SDC 1939, §51.1611.