'Word of Truth' in the Bible

By the word of truth, by the power of God, by the armour of righteousness on the right hand and on the left,

In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,

Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth.

Of his own will begat he us with the word of truth, that we should be a kind of firstfruits of his creatures.