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.”
Certainly! Let’s delve into a Bible study on Isaiah 8:20 from the King James Version (KJV). This verse is part of a larger context in which Isaiah prophesies about the impending Assyrian invasion of Judah. In this particular verse, Isaiah provides guidance to the people of Judah on seeking true spiritual guidance. Here’s the verse in its entirety:
Isaiah was a prophet who lived during the 8th century BCE in the Kingdom of Judah. During this time, the nation faced significant political turmoil due to threats from neighboring kingdoms, particularly the Assyrians. The people of Judah were divided in their response to these threats, some turning to false prophets and idolatrous practices for guidance. Isaiah was called by God to bring messages of warning, exhortation, and hope to the people.
Historical Context:
Isaiah was a prophet who lived during the 8th century BCE in the Kingdom of Judah. During this time, the nation faced significant political turmoil due to threats from neighboring kingdoms, particularly the Assyrians. The people of Judah were divided in their response to these threats, some turning to false prophets and idolatrous practices for guidance. Isaiah was called by God to bring messages of warning, exhortation, and hope to the people.
Understanding the Verse:
In Isaiah 8:20, the prophet Isaiah is instructing the people on how to discern true spiritual guidance from false teachings. He emphasizes two key sources of authority: “the law” and “the testimony.” Let’s examine these phrases:
– “The law”: Refers to the divine law given by God, specifically the commandments and instructions found in the Torah (the first five books of the Old Testament, also known as the Pentateuch). The law provided a moral and ethical framework for the Israelites and defined their relationship with God.
– “The testimony”: Refers to the prophetic word or the testimony of God’s messengers. Prophets were chosen by God to deliver His messages and warnings to the people. Their words served as a testimony to the truth and faithfulness of God.
Isaiah emphasizes that any teaching or prophecy must align with these authoritative sources. If someone claims to speak on behalf of God but contradicts the law or the prophetic testimony, they are devoid of true spiritual insight (“there is no light in them”). In other words, their teachings lack divine wisdom and are unreliable.
Application:
Isaiah’s words in this verse hold relevance and application for believers today. Here are some key lessons we can draw:
- Seek God’s Word: Just as the people of Judah were called to turn to the law and the testimony, we are encouraged to seek guidance from the Word of God. The Bible is our authoritative source for understanding God’s will, His character, and His instructions for living.
- Test Teachings: It is crucial to test any teaching or prophetic message against the Word of God. If something contradicts the principles and truths found in Scripture, it should raise a red flag. True spiritual guidance will always align with the unchanging truths of God’s Word.
- Discernment: This verse underscores the importance of discernment. In a world filled with diverse spiritual teachings and philosophies, we must develop a discerning spirit to recognize truth from falsehood. Cultivating a deep knowledge of Scripture and seeking the guidance of the Holy Spirit will aid us in this process.
- Reliance on God: Ultimately, this verse reminds us of our need to rely on God and His revealed Word. By staying anchored in His truth, we can avoid being led astray by false teachings and find our way to true light and understanding.

