Over 3,000 times, in some form or another, the Bible's authors claimed to be speaking for God. With phrases like "the word of God" and the "word of the Lord" they indicated that they believed their words were of divine origin. The Bible claims to be God's Word and absolutely true, like its divine author. "God is not a man, that He should lie, nor a son of man, that He should repent; has He said, and will He not do? Or has He spoken, and will He not make it good?" (Numbers 23:19).
This claim forces every human on the planet to make a choice. There is no neutral ground. Will people believe God's words or reject them? If we faithfully share the claims of His Word, the Holy Spirit will use His Word to convict the world of sin and rebellion against God (John 16:8).
God knew that false prophets would also claim to speak for Him, so He placed a death penalty if their words did not come true (Deuteronomy 13:5)! For a prophet to stand up and claim that he was delivering a message from the Lord was foolish unless he was convinced that what he spoke was truly from God.
[Read the rest of the article at Answers in Genesis.]