Numbers 23:19 God is not man, that he should lie, or a son of man, that he should change his mind. Has he said, and will he not do it? Or has he spoken, and will he not fulfill it?
Once one has established that the Bible is divinely inspired, breathed out by God, the next logical conclusion is to consider it to be without any errors. This can only be the case if God is Himself without error and if He is the author of Scripture. As previously stated, it can be argued that God spoke the words verbatim for biblical authors, that He gave them inspiration as to concepts, or that He gave them the words to summarize in their own way. In any event, the human author is capable of error, but God is not.
One of God’s attributes is perfection. His holiness, the quality of being “set apart” and transcendent, gives Him the right to set the standard of what truth is. God is incapable of lying because truth is based on what and whom He is. Because He is also omniscient, He is not able to make mistakes. He knows all things, even events that have not yet happened. Because of this, He is the only one capable of authoring a text free from errors.
God’s Word is trustworthy because it contains no errors, as it comes right from the mouth of the Lord. He is incapable of error, infallible. And His Word is infallible as well.