Commentaries:
Jamieson, Fausset, and Brown
To the law, etc.—the revelation of God by His prophet (Isaiah 8:16), to which he directs them to refer those who would advise necromancy.
if they speak not . . . it is because—English Version understands "they" as the necromancers. But the Hebrew rendered "because" is not this but "who"; and "if not," ought rather to be "shall they not"; or, truly they shall speak according to this word, who have no morning light (so the Hebrew, that is, prosperity after the night of sorrows) dawning on them [MAURER and G. V. SMITH]. They who are in the dark night of trial, without a dawn of hope, shall surely say so, Do not seek, as we did, to necromancy, but to the law," etc. The law perhaps includes here the law of Moses, which was the "Magna Charta" on which prophetism commented [KITTO].
Other Jamieson, Fausset, and Brown entries containing Isaiah 8:20:
Isaiah 1:2
Isaiah 8:21-22
Isaiah 34:16
Isaiah 65:4
Jeremiah 28:9
1 Thessalonians 5:21-22
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