The Bible is "the word of God". - 1 Thessalonians 2:13
God "cannot lie". - Titus 1:2
How can we know that what these Bible verses say are true? Or is the Bible just a book of myths and legends?
This link shows a short video that outlines the criteria for a book to be considered as the Word of God. You may follow it to see this surprising information:
How Can We Be Sure the Bible Is True?