Isaiah 8:20
"To the law and to the testimony: if they speak not according to this word, it is because there is no light in them."
Cross References (ranked by relevance)
We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:
These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me.
The entrance of thy words giveth light; it giveth understanding unto the simple.
The wise men are ashamed, they are dismayed and taken: lo, they have rejected the word of the LORD; and what wisdom is in them?
Bind up the testimony, seal the law among my disciples.
Professing themselves to be wise, they became fools,
Then shall we know, if we follow on to know the LORD: his going forth is prepared as the morning; and he shall come unto us as the rain, as the latter and former rain unto the earth.
But unto you that fear my name shall the Sun of righteousness arise with healing in his wings; and ye shall go forth, and grow up as calves of the stall.
Therefore night shall be unto you, that ye shall not have a vision; and it shall be dark unto you, that ye shall not divine; and the sun shall go down over the prophets, and the day shall be dark over them.
But the path of the just is as the shining light, that shineth more and more unto the perfect day.
Jesus answered and said unto them, Ye do err, not knowing the scriptures, nor the power of God.
But if thine eye be evil, thy whole body shall be full of darkness. If therefore the light that is in thee be darkness, how great is that darkness!
But he that lacketh these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins.
Hear the word of the LORD, ye rulers of Sodom; give ear unto the law of our God, ye people of Gomorrah.
He said unto him, What is written in the law? how readest thou?