mark 12:29 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord: - Free Bible Online

      29. And Jesus answered him, The first of all the commandments is--The readings here vary considerably. TISCHENDORF and TREGELLES read simply, "the first is"; and they are followed by MEYER and ALFORD. But though the authority for the precise form of the received text is slender, a form almost identical with it seems to have most weight of authority. Our Lord here gives His explicit sanction to the distinction between commandments of a more fundamental and primary character, and commandments of a more dependent and subordinate nature; a distinction of which it is confidently asserted by a certain class of critics that the Jews knew nothing, that our Lord and His apostles nowhere lay down, and which has been invented by Christian divines. (Compare Mt 23:23).
      Hear, O Israel; the Lord our God is one Lord--This every devout Jew recited twice every day, and the Jews do it to this day; thus keeping up the great ancient national protest against the polytheisms and pantheisms of the heathen world: it is the great utterance of the national faith in One Living and Personal God--"ONE JEHOVAH!"

JFB.