en_tn_condensed/isa/08/20.md

To the law and to the testimony

Possible meanings are 1) "Pay attention to God's instructions and teaching" or 2) "Then you must remember the teaching and testimony I gave." (Isaiah 8:16).

the law

This is the same word translated "official record" in Isaiah 8:16.

the testimony

See how you translated this in Isaiah 8:16.

If they do not say such things

"If they do not speak of the law and the testimony"

it is because they have no light of dawn

Isaiah speaks of people who do not know God as if they were people walking in darkness without any light. Alternate translation: "it is because they are like a person lost in the dark" (See: rc://en/ta/man/translate/figs-metaphor)