God’s word is infallible. If you want to see just how void of error, mistakes, or flaws that His word is, just take a look at Jesus. Jesus is the Word of the Father made manifest. John 1:14 (NKJV), And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth.
Jesus is the One that was hoped for, the One the prophets wrote and preached about. How is it that the people of God knew to expect a Messiah? Because of the Word of God. The first time we see the Father speak about Jesus is in the early chapters of Genesis. Talking to the serpent, God says, “And I will put enmity between you and the woman, and between your seed and her Seed; He shall bruise your head, and you shall bruise His heel.” – Genesis 3:15
The enemy did his very best to corrupt the gene pool down here (Genesis 6), but God was faithful to His word and brought forth the birth of King Jesus, the Lamb without blemish.
When we can’t bank on anything else, we can depend on the word of God. Too many throughout history have demonstrated to us the faithfulness of God Almighty to His word. When that ultimate promise comes and God dwells with man forever, even then, His word will stand true and undiminished. “Heaven and earth will pass away, but My words will by no means pass away.” – Matthew 24:35 (NKJV)
So shall My word be that goes forth from My mouth; It shall not return to Me void, But it shall accomplish what I please, And it shall prosper in the thing for which I sent it. – Isaiah 55:11 NKJV