'Word of Truth' in the Bible

in the word of truth, in the power of God, by the weapons of righteousness on the right hand and on the left,

in whom ye also, after having heard the word of truth, the glad tidings of your salvation, in whom, I say, having also believed, ye were sealed with the Holy Spirit that was promised,

Study to present thyself approved unto God, a workman not ashamed, rightly dividing the word of truth.

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