He that despised Moses' law died without mercy under two or three witnesses: He that despised Moses' law - Αθετησας· He that rejected it, threw it aside, and denied its Divine authority by presumptuous sinning, died without mercy - without any extenuation or mitigation of punishment; Numbers 15:30.
Under two or three witnesses - That is, when convicted by the testimony of two or three respectable witnesses. See Deuteronomy 17:6.