What biblical passage states, "The LORD is one," supporting the belief in one God?

The statement "The LORD is one" is found in Deuteronomy 6, which is central to the Jewish declaration of faith known as the Shema. This passage not only emphasizes the oneness of God but also serves as a foundational element in understanding monotheism within both Judaism and Christianity. It appears in Deuteronomy 6:4, where it states, "Hear, O Israel: The LORD our God, the LORD is one." This verse underscores the importance of recognizing that there is only one true God who deserves worship and devotion, aligning with key theological principles in the Christian and Missionary Alliance belief system.

While Psalm 119, Isaiah 41, and Matthew 22 contain significant teachings and truths about God, they do not explicitly communicate the oneness of God in the same foundational way that Deuteronomy 6 does. Psalm 119 focuses more on the law and the Word of God, Isaiah 41 contains prophecies and assurances of God’s sovereignty, and Matthew 22 involves teachings of Jesus regarding love and commandments, rather than establishing the concept of God's oneness directly. Therefore, Deuteronomy 6 is the passage that best represents this essential truth.